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1.      The diagram shows a motor, connected to a 240 V supply, driving a water pump.  The ammeter reads 5.0 A.

(a)     How much charge flows through the motor in one minute? Give the unit.

1 mark

(b)     (i)      What is the resistance of the motor? Give the unit.

1 mark  

(ii)     What is the power of the motor? Give the unit.

1mark

(c)     (i)      The motor and pump together have an efficiency of 50% (0.5).  How much energy is given to the water every second? Give the unit.

1 mark

(ii)     The pump has to raise the water up to a vertical height of 12 m.  What mass of water will the pump raise each second? Give the unit.  The value of g is 10 N/kg.

1mark  

2.          A circuit is shown below.

(a)     The switch is open.  Steven connects point A to point B with a piece of copper wire.

Which bulbs, if any, light up?

(b)     Steven removes the copper wire and uses it to connect point C to point D. 

         The switch is still open.  

         Which bulbs, if any, light up?

(c)     Steven removes the copper wire and closes the switch.  Both bulbs light up, but not very brightly.
He then uses the copper wire to connect point B to point C.

         Choose from the following words to answer the questions below.

gets brighter       stays the same       goes out

(i)      What happens to bulb X         

(ii)     What happens to bulb Y         

(d)     Steven removes the copper wire.  The switch is still closed.  Both bulbs light up, but not very brightly.  He then uses the copper wire to connect point A to point B.

         Choose from the following words to answer the questions below.

         gets brighter       stays the same       gets dimmer       goes out

(i)      What happens to bulb X       

(ii)     What happens to bulb Y         

 

 3.     A pupil makes some electrical circuits.
Each circuit contains a motor and a buzzer.
The motor and the buzzer can be switched on or off by three switches, A, B and C. 

         By each circuit diagram, state whether:

the motor is on or off;
the buzzer is on or off.

The motor is

The buzzer is

 

The motor is

The buzzer is

 

The motor is

The buzzer is

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