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NSC / Matric Electric Circuits — practice questions

Explore 6 free Electric Circuits questions in NSC / Matric Physics. Open each question or exercise to read its content, reference answers and available explanation.

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Electric Circuits questions and exercises with answers

Showing questions 1–6 of 6.

For an ohmic conductor held at a steady temperature, which quantity stays constant?Read the answer and worked solution →Electric current in a circuit is defined as what?Read the answer and worked solution →Three resistors are joined one after another with no branches between them. What is true of the current in each?Read the answer and worked solution →Why does the reading across a real battery drop once the battery is part of a working circuit?Read the answer and worked solution →A battery drives a larger current when its external resistance is reduced. What happens to the potential difference across its terminals?Read the answer and worked solution →Fill the series and parallel rulesRead the answer and worked solution →

Worked practice questions

For an ohmic conductor held at a steady temperature, which quantity stays constant?

  1. The product of voltage and current
  2. The sum of voltage and current
  3. The ratio of voltage to current
  4. The square of the current in it
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Correct answer: C. The ratio of voltage to current

1. Ohm's law says that for a resistor at constant temperature one particular ratio does not change. 2. That ratio is the potential difference across the resistor divided by the current through it. 3. The ratio itself is what we call the resistance of the component. 4. The product of voltage and current is the power, which changes as the current changes. _Source: Siyavula Physical Sciences Grade 12 (Everything Science, CC BY 4.0), Chapter 10: Electric circuits_

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Electric current in a circuit is defined as what?

  1. The rate of flow of energy
  2. The store of charge in a wire
  3. The push given by a battery
  4. The rate of flow of charge
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Correct answer: D. The rate of flow of charge

1. Charge moves around a complete circuit when a battery is connected. 2. Current measures how much of that charge passes a point in each second. 3. So current is defined as the rate of flow of charge through a circuit. 4. The push supplied by the battery is the potential difference, which is a different quantity. _Source: Siyavula Physical Sciences Grade 12 (Everything Science, CC BY 4.0), Chapter 10: Electric circuits_

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Three resistors are joined one after another with no branches between them. What is true of the current in each?

  1. It is the same in each one
  2. It is largest in the first
  3. It splits between them
  4. It is smallest in the last
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Correct answer: A. It is the same in each one

1. Resistors joined consecutively with no branches between them are in series. 2. Charge is never created or destroyed anywhere in the circuit. 3. With no branch to take charge away, the same charge that enters a resistor must leave it. 4. So the rate of flow of charge, the current, is the same at every point of the series string. 5. Splitting of the current happens only where the circuit branches, which is the parallel case. _Source: Siyavula Physical Sciences Grade 12 (Everything Science, CC BY 4.0), Chapter 10: Electric circuits_

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