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Power Calculations Power = current x potential difference Power = current2 x resistance 2 R 1. Find the power: a) power = ? current = 4 A pd = 30 V b) power = ? current = 12 A pd = 6 V (1) a) power = ? current = 3mA = _______A pd = 100 V (1) (1) 2. Find the power: c) power = ? current = 5 A resistance = 12 Ω d) power = ? current =2 A resistance = 200 Ω (1) a) power = ? current = 4 A resistance = 5KΩ = ______Ω (1) (1) 3. Find the unknown quantity: a) power = 500 W current = 4 A pd = ? a) power = 12 kW = _______W current = 10 A pd = ? (1) (1) a) power = 200W current = 5 mA pd = ? (1) 4 a What is the power of a 12 V, 50 A light? (1 mark) b What is the power of a bulb rated at 5 A, 6 V? (1 marks) c A 600 W electric heater is connected to a 120 V source. Calculate its current. (2 marks) d What is the power of an unknown device if a current of 35 mA flows through it when it is connected to a 3 V supply? (2 marks) Extra Challenge: 5 A microwave oven has a power of 1800 W and the potential difference applied from the mains is 230 V. What are its current and resistance? (3 marks) 6 A device has a resistance of 11 Ω and a current of 12 A. What is it power and potential difference? (3 marks) Score Percentage RAG