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- 1. Multiple ChoiceDefine electric current.It is the work done by the source in driving charges around a complete circuit.It is a measure of the rate of flow of electric charge through a given cross-section of a conductor.It is the work done by the source in driving a unit charge around a complete circuit.It is a measure of the flow of electric charge through a given cross-section of a conductor.
- 2. Multiple ChoiceWhat is the SI unit of electric current?WattsVoltageJoulesAmpere
- 3. Multiple Choice
What do the arrows in the circuit represent?conventional currenteletromotive forceelectron flowvoltage - 4. Multiple ChoiceWhich instrument is shown in the picture?voltmeterammetergalvanometermultimeter
- 5. Multiple ChoiceWhat is the function of a dry cell?A conductor that connect the components together.A method of opening or closing the circuit.A source of electromotive force that drives electric charges around the circuit.A load in which moving charges can do a useful job.
- 6. Multiple ChoiceWhat is the following component?dry cellfusebatteryresistor
- 7. Multiple ChoiceWhat is the following component?dry cellfuseresistorrheostat
- 8. Multiple ChoiceWhat is the following component?fixed resistorvariable resistor / rheostatfuseammeter
- 9. Multiple ChoiceWhat does the diagram show?an open circuita closed circuita short circuita long circuit
- 10. Multiple ChoiceWhat is the formula for current?I = t/QI = W/QI = Q/tI = W/t
- 11. Multiple ChoiceWhat is the formula for resistivity of a wire?R = ρL/AR = ρLAR = LA/ρR = L/Aρ
- 12. Multiple ChoiceThe potential difference across a component is 5 V. The current flowing through the component is 10 A. What is the resistance of the component?2 Ω0.5 Ω50 Ω0.05 Ω
- 13. Multiple ChoiceA 10 cm long wire with a cross-sectional area of 5 mm3 has a resistance of 40 Ω. It is then replaced with a wire of the same material, 20 cm long and with a cross-sectional area of 20 mm3. What is the new resistance?10 Ω20 Ω40 Ω80 Ω
- 14. Multiple ChoiceThe potential difference across a component is 50 V, and the charge that flows through the component is 25 C. What is the work done to drive these charges through?0.5 J2 J50 J1250 J
- 15. Multiple ChoiceThe amount of charge that flows through a component in 5 minutes is 600 C. What is the current through the component?0.5 A2 A120 A3000 A
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