# Block 2 Electricity Quiz

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9-12. P. 3.3 Students are able to describe electrical effects in terms of motion and concentrations of charged particles.

• 1.

### How do like charges act when put near each other?

• A.

Attract

• B.

Repel or pull apart

• C.

Push together

B. Repel or pull apart
Explanation
Like charges, such as two positive or two negative charges, repel each other. This means that when they are brought near each other, they experience a force that pushes them away, causing them to move apart. This repulsion is due to the electrostatic force, which is the force of attraction or repulsion between electrically charged objects. So, the correct answer is "repel or pull apart".

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• 2.

### In a series circuit, electricity travels on ____________ path(s).

• A.

Three

• B.

Two

• C.

One

• D.

More than one

C. One
Explanation
In a series circuit, electricity travels on only one path. This is because in a series circuit, all the components are connected in a single line, with the current flowing through each component one after the other. Therefore, there is only one route for the electricity to follow.

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• 3.

### Current that flows in one direction is called _________________________.

• A.

Electric

• B.

Direct current

• C.

Alternating current

• D.

Series current

B. Direct current
Explanation
Direct current is the correct answer because it refers to the flow of electric charge in one direction only. Unlike alternating current, which periodically changes direction, direct current maintains a constant flow in a single direction. This type of current is commonly used in batteries, electronic devices, and power transmission systems that require a steady and continuous flow of electricity.

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• 4.

### Most circuits in the school building are _______________ _________________.

• A.

Direct current

• B.

Series circuit

• C.

Parallel circuit

C. Parallel circuit
Explanation
Most circuits in the school building are parallel circuits. In a parallel circuit, the components are connected in such a way that there are multiple paths for the current to flow. This means that if one component fails or is removed, the other components will still receive current and continue to function. This is important in a school building where there are multiple rooms and areas that require electrical power. Additionally, parallel circuits allow for independent control of each component, making it easier to manage and troubleshoot electrical issues.

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• 5.

### In order for current to flow, what do you need to have the following:  (Select the correct answers)

• A.

Wire

• B.

Power source

• C.

Switch

• D.

Device to use the current ex. light

A. Wire
B. Power source
D. Device to use the current ex. light
Explanation
To allow current to flow, three components are necessary: a wire to conduct the current, a power source to provide the energy for the current, and a device (such as a light) that utilizes the current. A switch is not required for current to flow, as it simply controls the circuit's connectivity.

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• 6.

### If you take one light bulb out of a string of bulbs and the rest of them go out, you have what type of circuit.

• A.

Parallel circuit

• B.

Alternating current

• C.

Direct current

• D.

Series circuit

D. Series circuit
Explanation
If removing one light bulb from a string of bulbs causes all the other bulbs to go out, it indicates that the bulbs are connected in a series circuit. In a series circuit, the current flows through each component in a single path, so if one component fails or is removed, the circuit is broken and all other components stop working.

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• 7.

### A flashlight is example of what kind of circuit.

• A.

Parallel circuit

• B.

Series circuit

B. Series circuit
Explanation
A flashlight is an example of a series circuit because it has a single path for the flow of electric current. In a series circuit, the components are connected one after another, so if one component fails or is removed, the entire circuit will be broken and the other components will not work. In the case of a flashlight, the bulb, batteries, and switch are connected in series, allowing the current to flow through each component in sequence.

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• 8.

### What type of natural phenomena is an example of static electricity?

• A.

Hurricane

• B.

Lightning

• C.

• D.

Thunder

B. Lightning
Explanation
Lightning is an example of static electricity because it is a natural phenomenon that occurs due to the buildup and discharge of electrical energy. During a thunderstorm, the movement of air and water droplets causes positive and negative charges to separate. This separation creates an imbalance of charges, resulting in the buildup of static electricity. When the electrical potential difference becomes high enough, a discharge occurs, leading to the formation of a lightning bolt.

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• 9.

### Current that that flows in on more than one path is called a_________________.

• A.

Alternating current

• B.

Series circuit

• C.

Direct current

• D.

Parallel circuit

D. Parallel circuit
Explanation
A parallel circuit is the correct answer because it is a circuit configuration where the current has multiple paths to flow through. In a parallel circuit, the components are connected in such a way that the current can divide and flow through each path independently. This is in contrast to a series circuit where the current has only one path to flow through. Therefore, a parallel circuit allows for the flow of current on more than one path.

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• 10.

### If you have a string of lights and you add another light, all of the lights become dimmer.  What type of circuit is this?

• A.

Parallel circuit

• B.

Series circuit

• C.

Direct current

• D.

Alternating current

B. Series circuit
Explanation
A series circuit is a type of circuit where the components are connected in a single loop, meaning that the current flows through each component one after the other. In this case, when a new light is added, it becomes part of the loop and the current has to pass through it along with the other lights. Since the current is divided among all the lights, each light receives less current and therefore becomes dimmer. This is why when you add another light to a string of lights in a series circuit, all of the lights become dimmer.

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• 11.

### A diagram that uses symbols to show the parts of a circuit.

• A.

Conductor

• B.

Insulator

• C.

Schematic

• D.

Resistance

C. Schematic
Explanation
A schematic is a diagram that uses symbols to represent the different parts of a circuit. It provides a simplified and visual representation of the circuit, making it easier to understand and analyze. Unlike a conductor or insulator, which are materials that allow or prevent the flow of electricity respectively, a schematic is a visual representation tool. Similarly, resistance refers to the opposition to the flow of electric current in a circuit, which is not directly related to a schematic diagram.

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• 12.

### A measure of how easily electric current will flow through a material.

• A.

Insulator

• B.

Conductor

• C.

Resistance

• D.

Alternating current

C. Resistance
Explanation
Resistance is a measure of how easily electric current will flow through a material. It represents the opposition to the flow of electric current and is determined by the material's properties such as its length, cross-sectional area, and temperature. A higher resistance means that the material will impede the flow of current more effectively, while a lower resistance indicates that current can flow more easily.

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• 13.

### The type of current in the school building is _________________ current.

• A.

Alternating

• B.

Direct

• C.

Series

• D.

Parallel

A. Alternating
Explanation
The correct answer is alternating because alternating current (AC) is the type of current commonly used in school buildings. AC is characterized by the continuous and periodic change in direction of the flow of electric charge. It is the most efficient and practical way to distribute electricity over long distances and is used for powering lights, appliances, and other electrical devices in buildings.

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• 14.

### Most circuits in homes or in the school building are ______________.

• A.

1000 volt

• B.

120 volts

• C.

120 watts

• D.

240 volts

B. 120 volts
Explanation
Most circuits in homes or school buildings are typically designed to operate at a standard voltage of 120 volts. This voltage level is considered safe for household appliances and lighting fixtures, and it is the standard voltage used in most residential and commercial electrical systems. Higher voltages, such as 240 volts, are typically used for larger appliances or specialized equipment that require more power. Therefore, 120 volts is the most common voltage found in household and school circuits.

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• 15.

### Choose the following items that are insulators.

• A.

Rubber

• B.

Copper

• C.

Plastic

• D.

Gold

• E.

Silver

• F.

Wood

A. Rubber
C. Plastic
F. Wood
Explanation
Rubber, plastic, and wood are all examples of insulators. Insulators are materials that do not conduct electricity or heat easily. They have high resistivity, which means that they impede the flow of electrons or heat through them. Rubber, plastic, and wood are commonly used as insulating materials in various applications, such as electrical wires, circuit boards, and building insulation. Copper, gold, and silver, on the other hand, are good conductors of electricity and heat, so they are not insulators.

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• 16.

### If a hair dryer uses 1.584 kw an hour and you use the hair dryer .5 hours a day, how much energy does the hair dryer use every day?

• A.

792 kwh

• B.

.792 kwh

• C.

79.2 kwh

• D.

7.92 kwh

B. .792 kwh
Explanation
The hair dryer uses 1.584 kW per hour and is used for 0.5 hours per day. To find the energy used every day, we multiply the power consumption by the duration of use: 1.584 kW/hour * 0.5 hours = 0.792 kWh. Therefore, the hair dryer uses 0.792 kWh of energy every day.

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• 17.

### If a halogen lamp uses 12.6 kw of energy in a week, how much does the electricity cost for the lamp if electricity is \$.10 an a kWh?

• A.

\$126.00

• B.

126 kWh

• C.

\$12.60

• D.

\$1.26

D. \$1.26
Explanation
The cost of electricity for the halogen lamp can be calculated by multiplying the energy usage (12.6 kWh) by the cost per kWh (\$0.10). This gives us a total cost of \$1.26.

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• 18.

### What helps prevent fires when a circuit is overloaded?

• A.

Circuit breaker

• B.

Wire

• C.

Switch

A. Circuit breaker
Explanation
A circuit breaker helps prevent fires when a circuit is overloaded by automatically shutting off the flow of electricity when it detects an excessive current. This protective device is designed to interrupt the circuit and stop the flow of electricity, preventing overheating and potential fire hazards. Unlike wires and switches, which are components of a circuit but do not have the capability to detect and respond to overloads, a circuit breaker actively monitors the current and provides a safety mechanism to prevent fires.

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• 19.

### A field in a region of space around a charge that shows fields of positive or negative charge

• A.

Electric charge

• B.

Electric force

• C.

Electric field

• D.

Electric current

C. Electric field
Explanation
An electric field is a region of space around a charge that shows fields of positive or negative charge. It is a property of electric charges and is created by the presence of these charges. Electric fields can exert forces on other charges, causing them to experience electric forces. The strength and direction of the electric field can be determined by the magnitude and sign of the charge creating it.

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• 20.

### Earth is like a giant_______________.

• A.

Sphere

• B.

Magnet

• C.

Force field

• D.

Pole

B. Magnet
Explanation
Earth is like a giant magnet because it has a magnetic field surrounding it. This magnetic field is generated by the movement of molten iron in the Earth's outer core. Just like a magnet, Earth has a north and south pole, and its magnetic field interacts with charged particles from the Sun, causing phenomena such as the auroras. Additionally, compasses align themselves with the Earth's magnetic field, further supporting the analogy of Earth being a magnet.

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