3.4_Simple electrical calculations (Multi Choice)

1. 1. What is the charge, Q, if a current of 10A flows for 5 seconds?

• 50 C

• 5 C

• 15 C

• 100 C

2. 2. What is the current flowing if a charge, Q of 30 coulombs is flowing for 10 seconds?

• 1A

• 2A

• 3A

• 4A

3. 3. How long has a current of 10A been flowing if there is a charge of 5 coulombs?

• 0.5 seconds

• 1 second

• 2 seconds

• 0.05 seconds

4. 4. What is the current being drawn in a circuit if the supply voltage is 20V and the circuit resistance is 5Ω?

• 2A

• 4A

• 5A

• 10A

5. 5. What is the resistance of a circuit with a 230V supply if 10A is being drawn?

• 23 Ohms

• 24 Ohms

• 25 Ohms

• 26 Ohms

6. 6. What is the current flowing in a circuit with a 4Ω and 6Ω resistor connected in series with a 24V supply?

• 2.0A

• 2.4A

• 3.0A

• 4.0A

7. 7. What is the total current drawn by a circuit with a 200V supply if two 4Ω resistors are connected in parallel?

• 25 A

• 50 A

• 100 A

• 200 A

8. 8. What is the power of a circuit with a 230V supply if 10A is being drawn?

• 2300W

• 230W

• 23W

• 23000W

9. 9. What is the total resistance of a circuit with four 8Ω resistors connected in parallel?

• 2Ω

• 4Ω

• 8Ω

• 16Ω

10. 10. A house has a 3.5kW heater and it is switched on for 4 hours. How much electrical energy has been used?

• 10kWh

• 12kWh

• 14kWh

• 16kWh