Two resistors 2 Ω and 5 Ω are connected in series with a 7 V battery. Find the potential difference across the 5 Ω resistor.
A resistor of 6 Ω is connected in series with another resistor of 4 Ω. A potential difference of 20 V is applied across the combination. Calculate:
(a) the current in the circuit, and
(b) the potential difference across the 6 Ω resistor.