Exercise 5 Unit 2: Outcome 5
1/. What remains constant in a series circuit?
2/. What remains constant in a parallel circuit?
3/. If three lamps were connected in series and each had the same resistance, what would be the voltage dropped across each one if the supply voltage was 230 V?
5/. Three resisters of 4 Ω, 16 Ω and 24 Ω are connected in parallel. If the supply voltage is 110 V, what will be the:
i/. total resistance:
ii/. current in each leg of the circuit:
iii/. total current:
6/. Four resisters are connected in a series/parallel circuit. The 6 Ω and 12 Ω resistors are connected in parallel with each other and are then connected in series with the 17 Ω and 27 Ω resistors that are also connected in parallel with each other. If the supply voltage is 230 V, calculate:
i/. Total resistance:
ii/. Total current:
iii/. Voltage dropped across each network:
iv/. Current in each leg of the networks:
7/. A cell has a terminal voltage of 1.95 V when supplying a current of 8.2 A. The terminal voltage rises to 2.1 V when the load is switched off. What is the internal resistance of the cell?
8/. Two resistors of 5 Ω and 10 Ω are connected in parallel across a battery. The e.m.f of the battery is 24V and the internal resistance is 1.2 Ω. Determine the total current in the circuit and terminal voltage of the battery. What will be the voltage dropped across the two parallel resistors?
Electrician Forum 2008 (
www.electricianforum.co.uk)