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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. •I1 = I2 = I3 2. What effect does increasing the resistance of a circuit have on the current? • As resistance increases current decreases. 3. In which position is the voltmeter/ammeter? A V 4. Calculate the total resistance. 20Ω 10Ω 5Ω 1 1 1 1 1 0.05 0.2 0.25 RT RT RT 20 5 RT 1 4 1 0.25 RT 10 4 14 5. Two identical bulbs are connected in series 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. 2 I •P= R 2 • P = (5) x 330 • P = 8250W 7. Two identical 10Ω resistors are connected to a 9V supply. What is the current through each resistor? • R = 10 + 10 = 20Ω • I=V/R=9/20 • I = 0.45A 8. State the relationship for voltage in a parallel circuit. • Voltage in a parallel circuit is equal across each branch. VT = V1 = V2 = V3 9. What is electrical power? • The rate at which electrical energy is converted to other forms. • Energy per second 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 12V 4V 13. What is current? •The rate of flow of electric charges around a circuit. • The charge per second that passes a point. 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 bulb? • IT = I1 + I2 • 4 = 3 + I2 • I2 = 1A 4A 3A 17. What is the total resistance of a 20Ω & 30 Ω resistor in parallel? 1 1 1 RT RT RT 1 1 1 RT 20 30 1 0.05 0.033 0.083 RT RT 1 12 1 0.083 18. Calculate the energy used by a 12V kettle in 2minutes if it draws 3A from it’s supply. • P = IV = 3x12 = 36W E = Pt E = 36x2x60 E = 4320J 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.