The potential difference in a circuit is 5V. There are two resistors connected in series of resistance 10 Ohms. Calculate the current I in the circuit.
Ohm's law states that V=IR ; where V is p.d., I is current and R is resistance.
Firstly the two resistors are in series so the total resistance is just the sum of the two resistances. Therefore R = 10+10 = 20 Ohms.
The potential difference V is 5V.
By rearranging Ohm's law for the current I, I=V/R the current can be found by 5/20 = 0.25A
RS
Related Physics GCSE answers
All answers ▸A lorry is travelling around a roundabout at constant speed. Why is its velocity changing?
A man decides to shoot a rifle whilst on a wheelchair. Explain in terms of conservation of momentum what happens to the man as the shot is fired.
A typical question is about energy transfer - Explain the process of convection and give an example of where we can find them
How do stars form?