For 20 Ω resistance are connected in series and the combination is connected to a 20 V emf. The potential difference across any one of the resistors is
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.
Three identical cells, each of emf 2 V and unknown internal resistance are connected in parallel.This combination is connected to a 6Ω resistor. The terminal potential difference across each cell is 1.5 V. What is the internal resistance of each cell?