Charge, Electricity, And Circuits
Basically, the act of moving or revolving around as in a circle or orbit is what defines a circuit. In electricity, a circuit is an enclosed path of an electric current and it’s usually designed for a particular function. The quiz below on charge, electricity, and circuits will broaden your understanding. Give it a try!
- 1.
What is the standard electric potential delivered in household circuits?
- A.
120 V
- B.
120 O
- C.
120 A
- D.
120 O
- E.
240 A
Correct Answer
A. 120 VExplanation
The standard electric potential delivered in household circuits is 120 V. This is the voltage that is typically supplied by the power company to homes in order to power electrical devices and appliances. V stands for volts, which is the unit of measurement for electric potential.Rate this question:
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- 2.
The difference between conventional current and the true flow of charge in a circuit is best stated by the following:
- A.
The flow of actual charges is the same as conventional current.
- B.
Actual charges move much faster than those depicted by conventional current.
- C.
The true flow of charge in a circuit is in the opposite direction of conventional current.
- D.
Conventional current indicates how charges really move in a circuit, which is from the positive to the negative terminal of a battery.
Correct Answer
C. The true flow of charge in a circuit is in the opposite direction of conventional current.Explanation
The correct answer is that the true flow of charge in a circuit is in the opposite direction of conventional current. This means that while conventional current assumes that positive charges flow from the positive terminal to the negative terminal of a battery, the actual flow of charge is in the opposite direction, from the negative terminal to the positive terminal. This is because electrons, which carry the charge, are negatively charged and are the ones that actually move in a circuit.Rate this question:
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- 3.
The image shown is the circuit symbol for a
- A.
Battery.
- B.
Switch.
- C.
Motor.
- D.
Resistor.
- E.
None of the above.
Correct Answer
D. Resistor.Explanation
The image shown represents the circuit symbol for a resistor. A resistor is an electrical component that limits the flow of current in a circuit. It is typically used to control the amount of current flowing through a circuit or to create a voltage drop. The symbol for a resistor is a zigzag line, which matches the image provided. Therefore, the correct answer is resistor.Rate this question:
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- 4.
When sketching electrical fields around a charged object,
- A.
Arrows are drawn from the positively charged object.
- B.
Arrows are drawn from the negatively charged object.
- C.
Lines are drawn connecting the any two charged objects.
- D.
Arrows are drawn from all charged objects.
Correct Answer
A. Arrows are drawn from the positively charged object.Explanation
When sketching electrical fields around a charged object, arrows are drawn from the positively charged object. This is because the direction of the electric field lines represents the direction in which a positive test charge would move if placed in the field. Since like charges repel each other, the positive test charge would move away from the positively charged object, hence the arrows are drawn away from it.Rate this question:
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- 5.
A voltmeter reads _____________.
- A.
Current.
- B.
Resistance.
- C.
Charge.
- D.
Electric potential difference.
- E.
None of the above.
Correct Answer
D. Electric potential difference.Explanation
A voltmeter is a device used to measure the electric potential difference between two points in an electrical circuit. It is not used to measure current, resistance, or charge directly. Therefore, the correct answer is electric potential difference.Rate this question:
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- 6.
Which of the following would NOT effect resistance:
- A.
Temperature.
- B.
Material composition.
- C.
Length.
- D.
Cross sectional area.
- E.
All of the above effect resistance.
Correct Answer
E. All of the above effect resistance.Explanation
The given question asks which of the options would not affect resistance. The correct answer states that all of the options listed (temperature, material composition, length, and cross-sectional area) do indeed affect resistance. This means that any change in temperature, material composition, length, or cross-sectional area would result in a change in resistance.Rate this question:
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- 7.
All objects with a resistance obey Ohm's law.
- A.
True
- B.
False
Correct Answer
B. FalseExplanation
Ohm's law states that the current flowing through a conductor is directly proportional to the voltage applied across it, and inversely proportional to the resistance of the conductor. However, not all objects with resistance obey Ohm's law. Some objects, such as diodes and transistors, have a non-linear relationship between current and voltage and therefore do not follow Ohm's law. Hence, the statement that all objects with resistance obey Ohm's law is false.Rate this question:
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- 8.
A voltmeter must be placed _________ to a resistor to be used.
- A.
Below
- B.
In parallel
- C.
In series next
- D.
Close
Correct Answer
B. In parallelExplanation
A voltmeter must be placed in parallel to a resistor to be used because in parallel connection, the voltmeter is connected across the resistor, allowing it to measure the voltage drop across the resistor accurately. Placing the voltmeter in series would disrupt the circuit and affect the measurement of voltage.Rate this question:
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- 9.
A fuse melts if the circuit it is in:
- A.
Is drawing too much current.
- B.
Has too much resistance.
- C.
Has too little electric potential.
- D.
Has too high of a capacitance.
Correct Answer
A. Is drawing too much current.Explanation
A fuse melts if the circuit it is in is drawing too much current. When the current passing through a circuit exceeds the rated capacity of the fuse, it heats up and melts, breaking the circuit and protecting it from further damage. This is a safety mechanism designed to prevent excessive current flow, which could lead to overheating, fires, or other hazards.Rate this question:
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- 10.
The electric company provides a household with:
- A.
Electrons that replenish those used to run household appliances.
- B.
Electric potential to charges in home circuits.
- C.
Resistance to prevent overloading of household circuits.
- D.
Capacitance to run appliances.
Correct Answer
B. Electric potential to charges in home circuits.Explanation
The correct answer is "electric potential to charges in home circuits." This means that the electric company provides the necessary electric potential for charges to flow through the home circuits and power the household appliances. It does not directly provide electrons, resistance, or capacitance.Rate this question:
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- 11.
A circuit has three resistors of 2 O, 6 O, and 10 O in series with a 3 V battery.A. What is the equivalent resistance?B. What is the current in the circuit?C. How much power is used by the circuit?D. How much energy is used by the circuit in 10 minutes?
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