5.1 - ELECTRICAL POTENTIAL DIFFERENCE, CURRENT AND resistance
1. If a current of 5A flows for 2s, how much charge flows?
2. How much energy is lost when +10C of charge flows from the +ve terminal to the -ve terminal of a 12v battery?
3. The resistivity of iron is 1.0 x 10^-7 Ωm, and the resistivity of coppers is 1.72 x 10^-7Ωm. The iron wire has a length of 1 m and a diameter of 4 mm. The copper wire has a length of 1m and a diameter of 2 mm. Which of the wires has a bigger resistance?
4. If the p.d. across a 4 Ω resistance is 12 V what current will flow?
2. How much energy is lost when +10C of charge flows from the +ve terminal to the -ve terminal of a 12v battery?
3. The resistivity of iron is 1.0 x 10^-7 Ωm, and the resistivity of coppers is 1.72 x 10^-7Ωm. The iron wire has a length of 1 m and a diameter of 4 mm. The copper wire has a length of 1m and a diameter of 2 mm. Which of the wires has a bigger resistance?
4. If the p.d. across a 4 Ω resistance is 12 V what current will flow?
5.2 - Electric currents
5. If the emf of a battery is 12 V, how much energy is converted from chemical to electrical when 3 c of change flow?
6. What Is the p.d. Across a resistor if 24 J of heat are produces when a current of 3 A flows through it for 20 s?
7. A current of 0.5 A flows when a battery of emf 6 V is connected to an 11Ω resistor. What is the internal resistance of the battery?
8. If a current of 2 A flows through a resistor that has a p.d. of 6V across it, how much power is dissipated?
9. A current of 3 A flows through an electric kettle connected to the 220 V mains. What is the power of the kettle and how long will it take to boil 1 litre of water?
10. Calculate the resistance for the circuit in the figure.
6. What Is the p.d. Across a resistor if 24 J of heat are produces when a current of 3 A flows through it for 20 s?
7. A current of 0.5 A flows when a battery of emf 6 V is connected to an 11Ω resistor. What is the internal resistance of the battery?
8. If a current of 2 A flows through a resistor that has a p.d. of 6V across it, how much power is dissipated?
9. A current of 3 A flows through an electric kettle connected to the 220 V mains. What is the power of the kettle and how long will it take to boil 1 litre of water?
10. Calculate the resistance for the circuit in the figure.