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 ▸How does temperature relate to the structure of solids and liquids?
Does a negative acceleration always mean that the object is slowing down?
explain how the resistance of a filament lamp changes as the potential difference across it increases
Explain why atmospheric pressure decreases with increasing altitude. (3 marks)