A Trivia Quiz On Electricity And Ohm's Law!

1. What is the unit for voltage?

Volts

Amperes

Ohms

Joules

The unit for voltage is volts. Voltage is a measure of the electric potential difference between two points in an electrical circuit. It represents the force or pressure that drives electric current through a conductor. Volts is the standard unit for measuring voltage in the International System of Units (SI).

Explanation

The unit for voltage is volts. Voltage is a measure of the electric potential difference between two points in an electrical circuit. It represents the force or pressure that drives electric current through a conductor. Volts is the standard unit for measuring voltage in the International System of Units (SI).

2. What is the unit for resistance?

Volts

Amperes

Ohms

Joules

The unit for resistance is ohms. Resistance is a measure of how much a material or device opposes the flow of electric current. It is represented by the symbol Ω and is named after the German physicist Georg Simon Ohm. The unit ohms represents the amount of resistance that reduces the electric current flow by one ampere when a voltage of one volt is applied.

Explanation

The unit for resistance is ohms. Resistance is a measure of how much a material or device opposes the flow of electric current. It is represented by the symbol Ω and is named after the German physicist Georg Simon Ohm. The unit ohms represents the amount of resistance that reduces the electric current flow by one ampere when a voltage of one volt is applied.

3. What is current?

The flow of charges, usually in the form of electrons

The newness of a battery or resistor

Something that blocks or slows the flow of electrons

The potential energy stored in a battery

Current is defined as the flow of charges, typically in the form of electrons. It refers to the movement of electric charges through a conductor, such as a wire. When there is a potential difference (voltage) applied across a conductor, the electrons are pushed and start to flow, creating an electric current. The strength of the current is determined by the number of charges flowing per unit time, measured in amperes (A). Therefore, the correct answer is "the flow of charges, usually in the form of electrons."

Explanation

Current is defined as the flow of charges, typically in the form of electrons. It refers to the movement of electric charges through a conductor, such as a wire. When there is a potential difference (voltage) applied across a conductor, the electrons are pushed and start to flow, creating an electric current. The strength of the current is determined by the number of charges flowing per unit time, measured in amperes (A). Therefore, the correct answer is "the flow of charges, usually in the form of electrons."

4. What is the unit for current?

Volts

Amperes

Ohms

Joules

The unit for current is amperes. Amperes (A) is the standard unit for measuring electric current. It represents the rate at which electric charge flows in a circuit.

Explanation

The unit for current is amperes. Amperes (A) is the standard unit for measuring electric current. It represents the rate at which electric charge flows in a circuit.

5. Which of these is the equation for Ohm's Law?

W = Fd

V = IR

R = IV

PE = mgh

Ohm's Law states that the voltage (V) across a conductor is directly proportional to the current (I) flowing through it, with the constant of proportionality being the resistance (R) of the conductor. This can be mathematically represented by the equation V = IR.

Explanation

Ohm's Law states that the voltage (V) across a conductor is directly proportional to the current (I) flowing through it, with the constant of proportionality being the resistance (R) of the conductor. This can be mathematically represented by the equation V = IR.

6. The resistance of a hotplate is 48 Ω. How much current does the plate carry when connected to a 120-V source?

120 A

2.5 A

5760 A

0.4 A

The current flowing through a circuit can be calculated using Ohm's Law, which states that current (I) is equal to voltage (V) divided by resistance (R). In this case, the voltage is given as 120 V and the resistance is given as 48 Ω. Therefore, the current can be calculated as 120 V divided by 48 Ω, which equals 2.5 A.

Explanation

The current flowing through a circuit can be calculated using Ohm's Law, which states that current (I) is equal to voltage (V) divided by resistance (R). In this case, the voltage is given as 120 V and the resistance is given as 48 Ω. Therefore, the current can be calculated as 120 V divided by 48 Ω, which equals 2.5 A.

7. What is the unit for energy?

Volts

Amperes

Ohms

Joules

The unit for energy is joules. Volts, amperes, and ohms are units used to measure voltage, current, and resistance respectively, but they are not units of energy. Joules, on the other hand, is the standard unit for measuring energy in the International System of Units (SI). It represents the amount of work done or energy transferred when a force of one newton is applied over a distance of one meter.

Explanation

The unit for energy is joules. Volts, amperes, and ohms are units used to measure voltage, current, and resistance respectively, but they are not units of energy. Joules, on the other hand, is the standard unit for measuring energy in the International System of Units (SI). It represents the amount of work done or energy transferred when a force of one newton is applied over a distance of one meter.

8. What is shown in this picture?

Resistors connected in parallel

Batteries connected in parallel

Resistors connected in series

Batteries connected in series

The picture shows resistors connected in series. In a series circuit, the components are connected one after another, creating a single pathway for the flow of current. In this case, the resistors are connected end to end, with the current passing through each resistor in succession. This arrangement increases the total resistance in the circuit, as the individual resistances add up.

Explanation

The picture shows resistors connected in series. In a series circuit, the components are connected one after another, creating a single pathway for the flow of current. In this case, the resistors are connected end to end, with the current passing through each resistor in succession. This arrangement increases the total resistance in the circuit, as the individual resistances add up.

9. What if a bird sat on a power line that was very close to the ground, placing one foot on the wire and one foot on the ground?

No current would flow through the bird, so nothing would happen

The bird would experience a voltage difference between the wire and the ground and would get fried

The bird's feet are insulated, so it doesn't matter what it touches

When a bird sits on a power line that is very close to the ground and places one foot on the wire and one foot on the ground, it completes a circuit between the wire and the ground. This creates a voltage difference between the wire and the ground, causing current to flow through the bird's body. As birds are not good conductors of electricity, the current flowing through its body can cause severe harm or even death, leading to the bird getting fried.

Explanation

When a bird sits on a power line that is very close to the ground and places one foot on the wire and one foot on the ground, it completes a circuit between the wire and the ground. This creates a voltage difference between the wire and the ground, causing current to flow through the bird's body. As birds are not good conductors of electricity, the current flowing through its body can cause severe harm or even death, leading to the bird getting fried.

10. A certain steam iron carries a current of 6.4 A when connected to a 120 V source. What is the resistance of the steam iron?

1.875 Ω

0.05 Ω

768 Ω

18.75 Ω

The resistance of an electrical device can be calculated using Ohm's Law, which states that resistance (R) is equal to voltage (V) divided by current (I). In this case, the voltage is given as 120 V and the current is given as 6.4 A. By dividing 120 V by 6.4 A, we get a resistance of 18.75 Ω.

Explanation

The resistance of an electrical device can be calculated using Ohm's Law, which states that resistance (R) is equal to voltage (V) divided by current (I). In this case, the voltage is given as 120 V and the current is given as 6.4 A. By dividing 120 V by 6.4 A, we get a resistance of 18.75 Ω.

11. Why can birds sit on a power line?

Because birds have minimal resistance compared to household electronics, so current is diverted to the houses instead

Because the wire is in the air and air has infinite resistance so no current flows through the wire

Because birds' feet are insulated so current is not conducted through them

Birds can sit on a power line because both of their feet are on the same voltage line. This means that there is no potential difference between their feet, and as a result, no current flows through the bird.

Explanation

Birds can sit on a power line because both of their feet are on the same voltage line. This means that there is no potential difference between their feet, and as a result, no current flows through the bird.

12. A typical size-D battery has about how many volts?

0.05 V

100 V

1.5 V

9 V

A typical size-D battery has a voltage of 1.5 V. This is a standard voltage for size-D batteries and is commonly used in various electronic devices such as flashlights, radios, and toys. The voltage of a battery determines its power and capacity to provide electrical energy to the connected device.

Explanation

A typical size-D battery has a voltage of 1.5 V. This is a standard voltage for size-D batteries and is commonly used in various electronic devices such as flashlights, radios, and toys. The voltage of a battery determines its power and capacity to provide electrical energy to the connected device.

13. Voltage is a measurement of what?

Radiant energy of a lightbulb in a circuit

Kinectic energy of a motor in a circuit

Potential energy stored in a battery

The flow of electrons

Voltage is a measurement of potential energy stored in a battery. Voltage represents the electric potential difference between two points in a circuit, indicating the amount of energy that can be transferred from the battery to the circuit. It is a measure of the force that pushes electric charges (electrons) through a circuit, enabling the flow of electric current.

Explanation

Voltage is a measurement of potential energy stored in a battery. Voltage represents the electric potential difference between two points in a circuit, indicating the amount of energy that can be transferred from the battery to the circuit. It is a measure of the force that pushes electric charges (electrons) through a circuit, enabling the flow of electric current.

14. What do the stripes indicate?

Amount of resistance

Amount of voltage

Amount of current

Amount of energy

The stripes on a component typically indicate the amount of resistance it has. Each color represents a specific value, and by reading the color code, one can determine the resistance value of the component. This is a common practice in electronics and helps in identifying and using the correct components for a circuit.

Explanation

The stripes on a component typically indicate the amount of resistance it has. Each color represents a specific value, and by reading the color code, one can determine the resistance value of the component. This is a common practice in electronics and helps in identifying and using the correct components for a circuit.

15. In the picture, how are the lightbulbs connected?

In series

In parallel

They are not connected

The lightbulbs are connected in parallel. This means that each lightbulb is connected directly to the power source, creating multiple separate paths for the current to flow. In a parallel circuit, if one lightbulb stops working, the others will still remain lit because they are not dependent on each other.

Explanation

The lightbulbs are connected in parallel. This means that each lightbulb is connected directly to the power source, creating multiple separate paths for the current to flow. In a parallel circuit, if one lightbulb stops working, the others will still remain lit because they are not dependent on each other.

16. What ultimately happens to the cow in this situation? During a thunderstorm, if lightning hits the ground near a cow, then the current starts to spread out in the groud. Since the ground is wet, it is easier to spread horizontally, and also, the ground is somewhat positively charged. When the current starts to spread while a cow is eating grass, the current flows from the cow's mouth (A), goes through its leg (B) and goes back to the ground. The current will flow until the voltage becomes zero. Because cow's hind leg (D) has lower potential energy than its front leg (C), the current can flow through the cow. The cow becomes a part of the electric circuit.

All the current builds up in the cow's bell which will shock the rancher later.

Nothing happens to the cow.

The cow feels a slight tingle but continues eating.

The cow gets a big electric shock and probably dies.

During a thunderstorm, if lightning hits the ground near a cow, the current spreads out in the wet ground. When the cow is eating grass, the current flows through its mouth, leg, and back into the ground. As the hind leg has lower potential energy than the front leg, the cow becomes a part of the electric circuit. All the current builds up in the cow's bell, which will shock the rancher later. Therefore, the cow gets a big electric shock and probably dies.

Explanation

During a thunderstorm, if lightning hits the ground near a cow, the current spreads out in the wet ground. When the cow is eating grass, the current flows through its mouth, leg, and back into the ground. As the hind leg has lower potential energy than the front leg, the cow becomes a part of the electric circuit. All the current builds up in the cow's bell, which will shock the rancher later. Therefore, the cow gets a big electric shock and probably dies.

17. Which of the following is the correct formula for calculating current (I) using Ohm's Law?

I = V * R

I = V / R

I = R / V

I = V + R

Ohm's Law states that the current (I) flowing through a conductor is directly proportional to the voltage (V) across it and inversely proportional to 1 the resistance (R). The formula for calculating current is I = V / R.

Explanation

Ohm's Law states that the current (I) flowing through a conductor is directly proportional to the voltage (V) across it and inversely proportional to 1 the resistance (R). The formula for calculating current is I = V / R.

18. What are these?

Batteries

Capacitors

Resistors

Transformers

These are all electronic components used in circuits. Batteries provide electrical energy, capacitors store electrical charge, resistors limit the flow of current, and transformers transfer electrical energy between circuits. Resistors specifically are used to control the amount of current flowing through a circuit by providing resistance to the flow of electrons.

Explanation

These are all electronic components used in circuits. Batteries provide electrical energy, capacitors store electrical charge, resistors limit the flow of current, and transformers transfer electrical energy between circuits. Resistors specifically are used to control the amount of current flowing through a circuit by providing resistance to the flow of electrons.

19. In this graph, what does the slope of the line represent?

Constant voltage

Constant current

Constant energy

Constant resistance

The slope of a line in a graph represents the rate of change between two variables. In the context of this question, the slope represents the change in resistance for a given change in another variable, such as voltage or current. If the slope is constant, it means that the resistance remains the same regardless of the change in the other variable. Therefore, the correct answer is constant resistance.

Explanation

The slope of a line in a graph represents the rate of change between two variables. In the context of this question, the slope represents the change in resistance for a given change in another variable, such as voltage or current. If the slope is constant, it means that the resistance remains the same regardless of the change in the other variable. Therefore, the correct answer is constant resistance.

20. In this circuit diagram, what are R₁, R₂, and R₃?

Batteries connected in series

Batteries connected in parallel

Resistors connected in series

Resistors connected in parallel

The circuit diagram shows three resistors connected in parallel. This means that the current flowing through each resistor is the same, while the voltage across each resistor may be different. In a parallel circuit, the total resistance is less than the smallest individual resistance, and the total current is equal to the sum of the currents flowing through each resistor.

Explanation

The circuit diagram shows three resistors connected in parallel. This means that the current flowing through each resistor is the same, while the voltage across each resistor may be different. In a parallel circuit, the total resistance is less than the smallest individual resistance, and the total current is equal to the sum of the currents flowing through each resistor.