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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