Q.1
If a charge flows through a resistor, which of the following happens to the resistor?
  • It gets colder
  • It gets hotter
  • It becomes positively charged
  • Nothing
Q.2
In a filament lamp, in what form is most of the energy lost?
  • Heat
  • Sound
  • Kinetic energy
  • Radio waves
Q.3
What is power?
  • The number of repetitions of squats a body-builder can perform
  • The number of cylinders in a car
  • The rate at which energy is absorbed
  • The rate at which energy is transferred
Q.4
What is the formula for power?
  • P = E⁄t
  • P = t⁄E
  • P = E⁄2t
  • P = 2E⁄t
Q.5
Calculate the power of an appliance that uses 1000 joules of energy in 5 seconds.
  • 100 W
  • 200 W
  • 300 W
  • 400 W
Q.6
Power, potential difference and current are correctly related by which equation?
  • P = I x V
  • P = 2I x V
  • P = I⁄V
  • P = I⁄2V
Q.7
What is the voltage of an appliance if it uses 200 J per second when supplied with a current of 5 A?
  • 10 V
  • 20 V
  • 30 V
  • 40 V
Q.8
Which equation correctly shows the relationship between energy transferred, voltage and charge?
  • E = V x Q
  • E = 2V x Q
  • E = V⁄Q
  • E = Q⁄V
Q.9
What is the energy transferred if the voltage is 5 V and the charge is 10 C?
  • 50
  • 25
  • 50 J
  • 25 J
Q.10
What size of fuse would be required for a 230 V, 500 W heater?
  • 3 A
  • 5 A
  • 13 A
  • 1 A
0 h : 0 m : 1 s