1. A cell has an emf of 1.50 V and an internal resistance of 0.0450. If there...

1. A cell has an emf of 1.50 V and an internal resistance of 0.0450Ω. If there is 0.250 A in the cell, what voltage is applied to the external circuit?

2. The voltage applied to a circuit is 11.8 V when the current through the battery is 0.500 A. If the internal resistance of the battery is 0.150Ω, what is the emf of the battery?

3. The emf of a battery is 12.0 V. If the internal resistance is 0.300Ω and the voltage applied to the circuit is 11.6 V, what is the current through the battery?

4. Three 1.50-V cells, each with an internal resistance of 0.0500 are connected in series to form a battery with a current of 0.850 A in each cell.

(a) Find the current in the external circuit.

(b) What is the emf of the battery?

(c) Find the internal resistance of the battery.