What is the unit of electrical resistance?
Coulomb
Ohm
Volt
Which equation correctly links voltage V, current I and resistance R?
V = I x R
V = I ÷ R
V = R ÷ I
A current of 0.5 A flows through a 22 Ω resistor. What is the value of the voltage across it?
0.23 V
11 V
44 V
What happens to the resistance of a metal as temperature increases?
Resistance remains unchanged
Resistance increases
Resistance decreases
A current of 300 mA flows through a 12 V lamp. What is the resistance of the lamp?
0.04 Ω
3.6 Ω
40 Ω
Which equation correctly links electric energy, time t, voltage V and current I ?
Electric energy = (V x I) ÷ t
Electric energy = (V ÷ I) ÷ t
Electric energy = I x t x V
Which equation correctly links electric power P, voltage V and current I?
P = V x I
P = I ÷ V
P = V ÷ I
How much energy is transferred in 5 minutes with a current of 10 A and a potential difference of 240 volts?
8 J
12,000 J
720,000 J
What is the power of a small electric motor if a current of 2 A flows when connected to a 24 V power supply?
0.083 W
12 W
48 W
What power is transmitted by a current of 2 A flowing through a 6 Ω resistor?
24 W
72 W