Twenty Questions Electricity 1.

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Presentation transcript:

Twenty Questions Electricity 1

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 same at all points in a series circuit.

As resistance increases. 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

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

5. Two identical bulbs are connected to a 9V battery 5. Two identical bulbs are connected to a 9V battery. What is the voltage across each bulb? 9/2= 4.5V

6. Calculate the power dissipated in a 330Ω resistor when a 5A current flows through it. P = I2 R P = (5)2 x 330 P = 8.25kW

7. Two identical 10Ω resistors are connected to a 9V supply 7. Two identical 10Ω resistors are connected to a 9V supply. What is the current through each resistor? I=V/R=9/(10+10) I = 0.45A

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 to other forms.

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. 9V 7Ω 6Ω

12. Calculate the voltage across the resistor. Vs = V1 + V2 12 = 4 + V2 V2 = 8V

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

The resistance of a resistor remains constant. 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 Temperature control on cooker Brightness control on a dimmer switch

16. What is the current through the resistor? IT = I1 + I2 4 = 3 + I2 I2 = 1A

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

E = Pt P = IV = 3x12 = 36W E = 36(2x60) E = 3.84kJ 18. Calculate the energy used by a 12V kettle in 2minutes if it draws 3A from it’s supply. E = Pt P = IV = 3x12 = 36W E = 36(2x60) E = 3.84kJ

19. What formula relates power, voltage and resistance? P = V2/R

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