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UCE (O-Level) Electric Circuits — practice questions

Explore 8 free Electric Circuits questions in UCE (O-Level) 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 1–8 of 8.

Ohm's law describes a metal conductor only while which quantity is held constant?Read the answer and worked solution →The filament of a light bulb gets much hotter as the supply voltage rises, so its resistance changes. What kind of conductor is it?Read the answer and worked solution →Three resistors are joined one after another in a single loop with a cell. How does the current in the second resistor compare with the current in the first?Read the answer and worked solution →How is the equivalent resistance of several resistors joined in series worked out?Read the answer and worked solution →A current of 4 amperes passes through a heater while the voltage across it is 12 volts. What power does the heater dissipate?Read the answer and worked solution →A lamp dissipates 60 watts and is left on for 120 seconds. How much electrical energy does it use?Read the answer and worked solution →Household electricity is sold in units of one kilowatt hour. What does one kilowatt hour mean?Read the answer and worked solution →Fill in the circuit ruleRead the answer and worked solution →

Worked practice questions

Ohm's law describes a metal conductor only while which quantity is held constant?

  1. The wire colour
  2. The wire mass
  3. The room size
  4. The temperature
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Correct answer: D. The temperature

1. Ohm's law relates the current through a conductor to the voltage across it. 2. The relationship holds for a metal conductor at a constant temperature. 3. Resistance changes with temperature in almost every metal, so temperature must be pinned down. 4. Only then does a graph of current against voltage come out as a straight line. _Source: Siyavula Physical Sciences Grade 11 (Everything Science, CC BY 4.0), Chapter 11: Electric circuits_

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The filament of a light bulb gets much hotter as the supply voltage rises, so its resistance changes. What kind of conductor is it?

  1. A non-ohmic conductor
  2. An ohmic conductor
  3. A perfect insulator
  4. A superconductor
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Correct answer: A. A non-ohmic conductor

1. Conductors that keep a constant resistance while voltage varies are called ohmic conductors. 2. The resistance of a filament wire increases dramatically as it warms to operating temperature. 3. A light bulb is therefore a common example of a non-ohmic conductor. 4. Its graph of voltage against current is a curve rather than a straight line. _Source: Siyavula Physical Sciences Grade 11 (Everything Science, CC BY 4.0), Chapter 11: Electric circuits_

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Three resistors are joined one after another in a single loop with a cell. How does the current in the second resistor compare with the current in the first?

  1. Larger in the first
  2. The same in both
  3. Larger in the second
  4. Zero in the second
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Correct answer: B. The same in both

1. Resistors joined one after another in a single loop form a series circuit. 2. In a series circuit there is only one path along which charge can flow. 3. The amount of current is therefore the same through any component in the circuit. 4. It is the voltage, not the current, that divides itself among series resistors. _Source: Siyavula Physical Sciences Grade 11 (Everything Science, CC BY 4.0), Chapter 11: Electric circuits_

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