# Download Electricity Worksheet 2 – Voltage, Current and Resistance

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Electricity Worksheet 2 – Voltage, Current and Resistance Question 1 Work out the voltages labelled “?” in each of the circuits below. ?V a) 12V b) 8V ?V d) c) 5V 4V 3V ?V ?V 3V 3V ?V Question 2 Current A1 = 6A Current A3 = 4A a) What is A2 and A4 b) What will happen if A3 is removed? Question 3 Are the following statements true or false? Explain why. a) The current at A is bigger than the current at E b) The two lamps are connected in series c) Connecting an extra lamp in position D means that the voltages across A and B drop. d) Connecting an extra lamp in position D means that the current at A and E goes up. A4 A1 A2 A ?V B A3 A E B C D C Question 4 Work out the currents labelled “?” in each of the circuits below. a) b) 2A ?A c) 5A ?A ?A ?A 4A 2.5A ?A V ?A 2A The following formula will be useful for the next questions V = I R I Question 5 Use the formula triangle shown to help you work out the current flowing in the circuit below. Remember to show all working! R Question 6 The circuit below contains 2 identical bulbs. 8V 12V 6W a) What is the current in this circuit? b) Which way will the current flow, clockwise or anticlockwise? (use conventional current, not electron flow) c) Another resistor is added and the current drops to 1.5A. What is the total resistance of the circuit now? A B The current through bulb A is 0.5A. a) What is the total current in the circuit? b) What is the resistance of bulb A? c) What is the total resistance of the circuit?