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3 x 12Ω resistors are connected in parallel to a 200V supply, calculate the total power of the circuit.

10,000W

400W

1,000W

1,111W

Two resistors of 20 ohms and 40 ohms are connected in series across a 120v d.c. supply, the current flowing in the circuit will be:

20 A

2 A

5 A

0.5 A

If three resistors are connected in series and have resistances of 20 Ω, 30 Ω, and 40 Ω then the total resistance would be

100 Ω

90 Ω

70 Ω

80 Ω

3 x 20Ω resistors are connected in series to a 200V supply, calculate the total power of the circuit.

10 KW

0.666 KW

0.333 KW

12 KW

For the circuit shown the total resistance is

10 Ω

15 Ω

To measure the current through a load the meter must be connected

across the load

in parallel with the supply

in parallel with the load

In series with the load

To measure the voltage across a load the meter must be connected

before the load

In the diagram below if I1 and I2 are ammeter readings then

I2 will be greater than I1

I1 will be greater than I2

I1 will be equal to I2

I1 will be half I2

In the diagram below instrument A measures

the current through R3

the current through R1 and R2

the volt drop across R1 and R2

the volt drop across R1 and R3

In the diagram below instrument B measures

the current through R1

the volt drop across R1

Instrument A measures

current through a resistor

supply current

Voltage across a resistor

supply voltage

Instrument E measures

For the circuit shown above the total current is

0.1A

10A

20A

1.1A

If four resistors each of 50 Ω are connected in parallel the overall resistance is

25 Ω

12.5 Ω

200 Ω

Which of the instrument numbers would measure current

none of them

1 and 3

2 and 3

1

Which of the instrument numbers would measure voltage

3

2

Meter M1 will measure

the supply current

Meter M2 will measure

the volt drop across R2 and R3

the supply voltage

Instrument 4 is measuring

the current through the resistor

the voltage across the resistor

Instrument 2 above is measuring

Of the following materials which would be the BEST conductor of electricity?

Nichrome

Steel

Aluminium

Copper

A poor conductor of electricity is:

Glass

Silver

The resistance of an electrical conductor is:

Affected by the weather

Determined by the formula I = P x V

Inversely proportional to length and proportional to c.s.a

Proportional to the length and inversely proportional to the c.s.a

What is the formula for two resistors in parallel?

R1 + R2/R1 - R2

R1 - R2/R1 x R2

R1 + R2/R1 x R2

R1 x R2/R1 + R2

When the current through a conductor increases

the voltage decreases

the temperature decreases

the temperature increases

the resistance decreases