Linking current, potential difference and resistance

12 questions

1. The number of coulombs that flow past a point each second equals the…
2. The unit of current is the…
3. A circuit which has only one loop is called a ___ circuit.
4. In a circuit, electrons flow through the wires away from the ___ end of the battery.
5. In a circuit with a single loop, which of the following statements are correct?
6. The equation relating current, charge and time is: current = charge ÷ time. Which of the following equations is the correct rearrngement of the equation with time as the subject?
7. Match the following quantities to its definition.
8. A series circuit contains only a cell and a lamp. Which of the following changes occurs if another lamp is added, in series with the first lamp?
9. In a series circuit, there is a particular type of relationship between current and total resistance: the current is ___ proportional to the total resistance, if the p.d. stays the same.
10. The potential difference across a 10 Ω resistor in a circuit is 4.0 V. What is the current in the resistor?
11. A motor has a resistance of 6.0 Ω. What p.d. is needed to make a current of 1.5 A flow through the motor?
12. A pupil has identical lamps and identical cells. He connects two cells and two lamps in series. Then he changes the circuit, but the current does not change. Which of the following could he have done?

License: OGL