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Worksheetselectricity
Total questions: 35
Worksheet time: 48mins
A higher resistance in a circuit causes a _____________.
higher voltage
larger current
smaller current
lower voltage
Which of the following materials is used in a light bulb to produce heat and light?
Nichrome
Copper
Tungsten
Steel
What voltage is needed to cause a 50A current flow through a 10Ω resistor?
15V
500V
500 kV
0.2V
Galvanometer is used to
detect electric current
negative terminal to positive terminal
positive terminal to negative terminal
the flow rate of electric charges through a conductor
If the current in an electrical circuit is constant, what will happen to the voltage if the resistance is increased?
Voltage will increase
Voltage will decrease
Voltage will stay the same
Why are Christmas lights wired in parallel?
It is cheaper to make
You can make longer strands
It uses less electricity
If a light breaks, the others keep working
What is used to measure electric current?
Voltmeter
Ammeter
Wattmeter
pH meter
Name the instrument given in the picture
Ammeter
Voltmeter
Coulomb is the unit of
Charge
Current
Potential difference
Resistance
Unit of electric power may also be expressed as
volt ampere
kilowatt hour
watt second
joule second
What is the unit of current?
Volts
Ampere
Ohm
Tesla
Which subatomic particle is used in the process of electricity?
Electrons
Protons
Neutrons
What is the definition of current?
rate of flow of neutrons
rate of flow of charges
rate of flow of protons
rate of flow of energy
A student carries out an experiment and plots the V-I graph of three samples of nichrome wire with resistances R1 R2 and R3 respectively. Which of the following is high ?
R1 = R2 = R3
R1 > R2 > R3
R3 > R2 > R1
none of these
Calculate the current flows through the 10 Ω resistor in the following circuit.
1.2 A
0.6 A
0.2 A
2.0 A
An electric iron draws a current 4 A when connected to a 220 V mains. Its resistance must be
1000 Ω
55 Ω
44 Ω
none of these
The slope of voltage (V) versus current (I) is called
resistance
conductance
resistivity
conductivity
Coulomb is the SI unit of:
charge
current
resistance
potential difference
100 J of heat is produced each second in a 4Ω resistor. The potential difference across the resistor will be:
30 V
10 V
20 V
25 V
An electric bulb is connected to a 220V generator. The current is 0.50 A. What is the power of the bulb?
440 V
220 V
110 V
55 V
Three resistors of 1 Ω, 2 ft and 3 Ω are connected in parallel. The combined resistance of the three resistors should be
greater than 3 Ω
less than 1 Ω
equal to 2 Ω
zero
What is the commercial unit of electrical energy?
Joules
Kilojoules
Kilowatt-hour
watt-hour
Electrical resistivity of any given metallic wire depends upon
its thickness
its shape
nature of the material
its length
The electrical resistance of insulators is
high
low
zero
infinity
The heating element of an electric iron is made up of:
copper
aluminium
nichrome
iron
When electric current is passed, electrons move from:
high potential to low potential.
low potential to high potential.
in the direction of the current.
against the direction of current
