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Download Electrical Energy Calculations (Higher). - School
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Electrical energy calculations [Higher] Aim To reinforce what you have learned about electrical energy and charge. 1 a) Calculate: i) the charge flow in 60 seconds in a wire when the current in the wire is 3.0 A. ............................................................................................................................................ ............................................................................................................................................ ii) the time taken for 80 C of charge to flow through a wire when the current in the wire is 5.0 A. ............................................................................................................................................ ............................................................................................................................................ iii) the current when 1200 C of charge flows through a wire in 200 s. ............................................................................................................................................ ............................................................................................................................................ b) A lamp in a circuit has a potential difference of 12 V across its terminals when the current through the lamp is 2.0 A. i) Calculate the charge flow through the lamp in 300 s. ............................................................................................................................................ ............................................................................................................................................ ii) Calculate the electrical energy supplied to the lamp in 300 s. ............................................................................................................................................ ............................................................................................................................................ 2 A 50 resistor in a circuit has a current of 0.20 A passing through it. Calculate: a) the charge passing through the resistor in 20 s. .................................................................................................................................................. .................................................................................................................................................. b) the potential difference across the resistor. .................................................................................................................................................. .................................................................................................................................................. c) the electrical energy supplied to the resistor in 20 s. .................................................................................................................................................. .................................................................................................................................................. 3 A 12 V battery is connected to a lamp in series with a resistor and an ammeter. A voltmeter is connected across the lamp, as shown below. The ammeter reading is 2.5 A and the voltmeter reading is 9.0 V. a) Calculate: i) the charge passing through the battery in 20 s. ............................................................................................................................................ ii) the electrical energy supplied by the battery in 20 s. ............................................................................................................................................ ............................................................................................................................................ b) i) Show that 450 J of electrical energy is supplied to the lamp in 20 s. ............................................................................................................................................ ............................................................................................................................................ ii) Calculate the electrical energy supplied to the resistor in 20 s. ............................................................................................................................................ ............................................................................................................................................
