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WorksheetsForm Four Electricity Quiz
Total questions: 40
Worksheet time: 35mins
1. The colour code of a 47 KΩ resistor
Yellow,violet,orange
Yellow,orange, violet
Orange,violet,orange
Violet,orange,violet
1. Three resistance, each 21Ω are connected in series. The total resistance is:
7.Ω
63Ω
21Ω
24Ω
An electrical appliance is rated at 600 W. How much electrical energy will it use in 4 sec?
24 joules
2.4 KJoules
125 W
125 KW
An electric cooker is rated at 2 KW. The energy used in 2 mins is:
240 KJoules
0.5 KJoules
5 KJoules
30 KJoules
1. The colour code of a 220Ω resistor with a 5% tolerance is:
Red red brown gold
Red red brown silver
Red red black gold
Red red black silver
An electrical appliance is rated at 500 W. In 10 Sec the electrical energy used is:
500 Joules
0.5 Joules
50 Joules
5 KJoules
1. A lamp uses 2.5 K joules in 25 seconds. Its power is:
250 W
80 W
30 W
100 W
In a circuit the applied voltage is 10 V. If the current is 2 milli-Amperes, the resistance is:
5 KΩ
5Ω
0.5 KΩ
0.5 Ω
The current flowing in a circuit is 4 milli-ampere. If the resistance is 2 KΩ, the voltage is:
8 mV
8V
0.8 V
0.8 MV
The opposition to the movement of electrons is called:
resistance
current
potential
charge
If two resistors are connected in series, their total resistance will be:
less than the value of either resistor
the sum of the two resistor values
the difference of the two resistor values
the product of the two resistor values
Two resistors with the values 3 Ω and 6 Ω are connected in parallel. What is their combined resistance?
9 Ω
18 Ω
3 Ω
2 Ω
How is the current in a DC circuit calculated?
By dividing voltage by resistance
By multiplying voltage by resistance
By adding voltage and resistance
By dividing resistance by voltage
What value of resistance will pass a current of 3 Amperes when 45 V is connected across it?
48 Ω
30 Ω
15 Ω
135 Ω
Three resistors with the values 3 Ω, 12 Ω, and 6 Ω respectively are connected in series. What is their combined resistance?
15 Ω
6 Ω
1.7 Ω
21 Ω
Three 12 Ω resistors are connected in parallel. The total resistance is:
4 Ω
36 Ω
12 Ω
15 Ω
A potentiometer is:
a fixed resistor
a variable resistor
a resistor with no tolerance
used to measure potential difference
The colour code of a 250 Ω resistor is:
red, green, brown
brown,yellow, black
red, blue, brown
brown, green, black
A resistor with a nominal value of 450 Ω and a tolerance of 20 % would have a maximum value of :
540 Ω
470 Ω
380 Ω
9000 Ω
The 1st band is grey, the 3rd band is red. What is the colour of the second band if the value of the resistor is 8.4 KΩ?
Yellow
Orange
Gold
Blue
The SI unit for resistivity is:
ohms/metre
ohms-metre
ohm
mho-metre
The first band of a resistor is red, and the second band is green. What is the colour of the third band if the value of the resistor is 2.5 KΩ?
Red
Orange
Brown
Yellow
Materials whose resistance increases as temperature decreases have:
a negative temperature coefficient
a positive temperature coefficient
a zero temperature coefficient
a decreasing temperature coefficient
What is the basic unit of electric power?
The Joule
The Volt
The Watt
The Ampere
0.05 W can be written as :
5 x 10-3 W
5 mW
50 mW
5 kW
An electric heater rated at 2 kW, 220 V is accidentally connected to a 110 V supply. Then, the heater will develop:
2 kW
1 kW
1.5 kW
0.5 kW
A consumer's meter read 2345 kWh on June,01, and 2543 kWh on June,30. If electricity cost $0.325 cents unit, what will be his bill for June?
$78.25
$1588.60
$76.20
$64.35
If V= 6 v and R= 3Ω, then P equals:
108 W
2 W
12 W
18 W
Suppose you let two 60 W lamps light continuously for 9 h 45 mins. How much energy will be consumed?
1.13 kWh
129.45 kWh
585 kWh
1.17 kWh
The unit of electrical energy is the :
watt
ampere
kilowatt-hour
coulomb
A 750 W heater consumes 6.75 kWh in :
111 h
5 h
9 h
0.9 h
The current in an electric circuit can be calculated as:
power ÷ resistance
voltage x power
power ÷ voltage
voltage x resistance
A resistor causes a voltage drop of 40 V and dissipates 8 W when connected in a circuit. How much current is flowing?
200 mA
5 A
320 A
20 mA
When 120 V is applied to a circuit uses, 800 mA flows. What is the input power?
1040 W
680 W
920 W
96 W
Kilowatt-hour means:
kilowatt/hours
kilowatt x hours
kilowatt + hours
1000 W
If 200 mA of current is flowing through a 100 Ω resistor, how much power is wasted?
40 W
0.25 W
4 W
2 W
If an 80 Ω resistor causes a 10 v drop, how much power is it dissipating?
1.25 W
800 W
1.25 mW
8 W
What is the resistance and power ratings of a resistor which produces a 5 V drop with a current of 25 mA?
200 Ω, 125 mW
2 KΩ, 5 W
5 KΩ, 125 W
0.2 Ω, 125 W
The term that describes how fast electrical energy is used is:
current
power
voltage
kilowatts-hours
A 12 V battery supplies a DC circuit whose resistance is 144 kΩ. Determine the power dissipated by this circuit?
1 W
12 W
1 kW
1 mW
