Twenty Questions Electricity 1 Twenty Questions 1 2

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Twenty Questions Electricity 1

Twenty Questions Electricity 1

Twenty Questions 1 2 3 4 5 6 7 8 9 10 11 12

Twenty Questions 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20

1. State the relationship for current in a Series circuit. • Current is the

1. State the relationship for current in a Series circuit. • Current is the same at all points in a series circuit.

2. What effect does increasing the resistance of a circuit have on the current?

2. What effect does increasing the resistance of a circuit have on the current? • As resistance increases.

3. In which position is the voltmeter/ammeter? A V

3. In which position is the voltmeter/ammeter? A V

4. Calculate the total resistance. 20Ω 10Ω 5Ω

4. Calculate the total resistance. 20Ω 10Ω 5Ω

5. Two identical bulbs are connected to a 9 V battery. What is the

5. Two identical bulbs are connected to a 9 V battery. What is the voltage across each bulb? • 9/2= 4. 5 V

6. Calculate the power dissipated in a 330Ω resistor when a 5 A current

6. Calculate the power dissipated in a 330Ω resistor when a 5 A current flows through it. 2 I • P= R 2 • P = (5) x 330 • P = 8. 25 k. W

7. Two identical 10Ω resistors are connected to a 9 V supply. What is

7. Two identical 10Ω resistors are connected to a 9 V supply. What is the current through each resistor? • I=V/R=9/(10+10) • I = 0. 45 A

8. State the relationship for voltage in a parallel circuit. • Voltage in a

8. State the relationship for voltage in a parallel circuit. • Voltage in a parallel circuit is equal across each branch.

9. What is electrical power? • The rate at which electrical energy is converted

9. What is electrical power? • The rate at which electrical energy is converted to other forms.

10. What is the function of a variable resistor? • To allow you to

10. What is the function of a variable resistor? • To allow you to vary the current in a circuit.

11. Which resistor has a greater potential difference across it? • The 7Ω resistor.

11. Which resistor has a greater potential difference across it? • The 7Ω resistor. 9 V 7Ω 6Ω

12 V 12. Calculate the voltage across the resistor. • Vs = V 1

12 V 12. Calculate the voltage across the resistor. • Vs = V 1 + V 2 • 12 = 4 + V 2 • V 2 = 8 V 4 V

13. What is current? • The flow of electric charges around a circuit.

13. What is current? • The flow of electric charges around a circuit.

14. What happens to the value of a resistor when the Voltage across it

14. What happens to the value of a resistor when the Voltage across it is increased? • The resistance of a resistor remains constant.

15. Give a practical application of a variable resistor. • Volume control on radio

15. Give a practical application of a variable resistor. • Volume control on radio • Temperature control on cooker • Brightness control on a dimmer switch

16. What is the current through the resistor? • IT = I 1 +

16. What is the current through the resistor? • IT = I 1 + I 2 • 4 = 3 + I 2 • I 2 = 1 A 4 A 3 A

17. What is the total resistance of a 20Ω & 30 Ω resistor in

17. What is the total resistance of a 20Ω & 30 Ω resistor in parallel?

18. Calculate the energy used by a 12 V kettle in 2 minutes if

18. Calculate the energy used by a 12 V kettle in 2 minutes if it draws 3 A from it’s supply. • E = Pt • P = IV = 3 x 12 = 36 W • E = 36(2 x 60) • E = 3. 84 k. J

19. What formula relates power, voltage and resistance? • P= 2 V /R

19. What formula relates power, voltage and resistance? • P= 2 V /R

20. What is Voltage? • The energy given to each charge in the circuit.

20. What is Voltage? • The energy given to each charge in the circuit.

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