Twenty Questions Electricity 1 Twenty Questions 1 2
- Slides: 22
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.
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. 20Ω 10Ω 5Ω
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 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 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 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. 9 V 7Ω 6Ω
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.
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 = 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 parallel?
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
20. What is Voltage? • The energy given to each charge in the circuit.
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