Q.1
How is the current of a resistor related to the potential difference across it?
  • Inversely proportional
  • Directly proportional
  • Equal
  • One-fifth of the potential difference
Q.2
An LED emits light when the current flows through it in which direction?
  • Forwards
  • Backwards
  • No current flow
  • Up and down
Q.3
If two resistors are connected in parallel in a circuit, which has a total electrical potential difference of five volts, what is the value of the electrical potential difference across each resistor?
  • 2.5 V
  • 1.25 V
  • 5 V
  • 10 V
Q.4
Which equation correctly relates voltage, resistance and current?
  • R = I⁄V
  • V= I⁄R
  • I = R⁄V
  • V = I R
Q.5
If a 100 ohm resistor is replaced with a 200 ohm resistor, whilst the potential difference is kept constant, what happens to the current?
  • Stays the same
  • Increases
  • Decreases
  • There is not enough information
Q.6
The current through a component depends on which of the following?
  • The resistance of the component
  • The size of the component
  • The material of the component
  • The color of the component
Q.7
If three 1.5V cells are connected in series, what is the total potential difference provided by the cells?
  • 3 V
  • 4.5 V
  • 5.5 V
  • 1.5 V
Q.8
What is the unit of resistance?
  • Ohm
  • Volt
  • Ampere
  • Coulomb
Q.9
If two five ohm resistors are connected in series, what is the total resistance of the circuit?
  • 5 ohms
  • 10 ohms
  • 2.5 ohms
  • 7.5 ohms
Q.10
What can be found by measuring current and voltage?
  • Resistivity
  • Resistance
  • The direction of true north
  • Magnetic field strength
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