BASIC ELECTRICITY REVISION HOMEWORK

  1. Draw the circuit symbols for a battery, a lamp and a switch. (use a ruler!)
  1. State the energy changes in a battery, a lamp and a heater and a motor.
  1. a) Draw a circuit containing a battery, a resistor and a bulb all connected

in series.

b) Draw a circuit containing one battery connected to two bulbs in

parallel.

c) Draw a circuit containing two resistors in parallel which are connected

to a bulb and a battery in series.

  1. a) Describe what is meant by a series circuit.

b) Describe what is meant by a parallel circuit.


5.
a) Copy out this circuit and show how an

ammeter should be connected.

b) What would the ammeter be



measuring?

c) What unit would the ammeter measure in?

6.a) On your diagram in question 5 add a voltmeter to measure the voltage

across the resistor.

b) What unit would the voltmeter measure in?

a) State the unit for current

A1 A2b) If the current through A1

is 5A, what is the current

through A2?

c) What is the current from

the battery?

  1. In the following circuit the supply voltage is 12V.

a) If both bulbs are identical, what is

the voltage across lamp 1?

b) If the current through lamp 1 is 3A,




what is the current through lamp 2?

lamp 1lamp 2

  1. .

a) In this circuit there are 3A going through

the resistor and 4A through the bulb. What

current is being drawn from the supply.

b) If the supply is 12V, what is the voltage across i) the resistor and ii) the bulb?



  1. . Complete the following table









  1. Draw the circuit symbols for a resistor and a variable resistor.
  2. How is the variable resistor different from an ordinary resistor?
  3. If the resistance of a variable resistor is increased, what happens to the current?
  4. Give two practical uses of a variable resistor.

13State the energy changes in a resistor.

14


a) Copy the circuit and add an

ammeter and a voltmeter to

measure the voltage across the



bulb.

b) How would you use these readings to calculate resistance of the bulb?

  1. a) What meter could you use to measure resistance directly?

b) What is the unit of resistance?

  1. If the voltage across a bulb is 6V and the current through it is 2A. What is the resistance of the bulb?
  1. Current through a resistor is 10A, and the voltage across it is 230V. What is the resistance of the resistor?
  1. Voltage across a heater is 12V, if current through the heater is 9.5A, what is its resistance?

19)A student investigates the resistance of a piece of metal using the circuit shown.The student measures the current in the circuit using an ammeter.

a)State what additional measurement is required to calculate the resistance of the metal.

b)The ammeter is moved to position X. State how the ammeter reading comparethe original value.

20)A student sets up an experiment to investigate the current in and the voltage across two different resistors (X and Y).The student uses a battery, an ammeter, a voltmeter and some wires to obtain measurements for each resistor.

Copy and complete the diagram shown above, by labelling the voltmeter and ammeter, to show how the measurements could be obtained.

The measurements obtained for each resistor are shown in the table.

Use the information in the table to calculate the resistance of resistor Y.