1) When 14 C of charge flows through a component in 20 s, the current in the component is equal to: a) 34 A b) 0.7 A c) 280 A d) 1.43 A 2) A current of 0.2 A flows through a light bulb for 60 s. How much charge passes through in this time? a) 62 C b) 0.003 C c) 12 C d) 300 C 3) Which component lets electric current go through in one direction only? a) diode b) resistor c) thermistor d) motor 4) An ammeter connected in series to a filament lamp and a 4.5 V battery reads 0.6 A. What is the resistance of the lamp? a) 2.7 Ω b) 7.5 Ω c) 0.13 Ω d) 5.1 Ω 5) Which of the following is the unit of power? a) watt b) joule c) ohm d) volt 6) A current of 0.5 A flows through a 20 Ω resistor. Calculate the potential difference across the resistor. a) 25 V b) 0.025 V c) 40 V d) 10 V 7) A kettle has electrical resistance of 12 Ω. What is the value of current flowing through the kettle when it is connected to 230 V mains electricity? a) 19.2 A b) 0.052 A c) 2760 A d) 218 A 8) A battery provides 30 J of energy for every one coulomb of charge. What is the voltage of the battery? a) 10 V b) 30 V c) 300 V d) 230 V 9) A hairdryer of power rating of 1800 W has been connected to 230 V. What is the current in the hairdryer? a) 0.12 A b) 7.8 A c) 414 A d) 2030 A 10) Additional lamps connected in series: a) decrease the total resistance b) do not change the total resistance c) increase the total resistance

Electrical circuits

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