WorksheetsElectrical system
Total questions: 25
Worksheet time: 15mins
What is potential difference?
Potential difference is a measure of the amount of obstacle against the flow of electrons in a circuit.
Potential difference is a measure of the amount of heat flowing between two points in a circuit.
Potential difference is a measure of the amount of current flowing between two points in a circuit.
Potential difference between two points is a measure of the amount of potential energy that is changed into other forms of energy when an electron passes between these two points.
The diagram below shows various parts of a light bulb.
Which effect of current is used to operate the light bulb?
(a)
A current of 5 A is allowed to flow through a resistor. Calculate how long it will take for 30 C of charges to pass through it.
(a)
Which one of the diagrams has the highest resistance?
A
B
The ammeter in the following circuit measures the current flowing through __________.
bulb 1 only
bulb 3 only
bulbs 1 and 2
bulbs 1, 2 and 3
A light bulb has a power rating of 40 W. When it is switched on how much energy is converted to heat and light energy in 1 second?
(a)
A household appliance with a power of 800 W is turned on for 1.5 hours. What is the cost of electricity if the unit cost of energy is 25-cents? Give your answers in $.
(a)
A heating element has a potential difference of 300 V applied across it. Given that 16 coulomb of charge passes through it, calculate the work done to push each coulomb of charge through the heating element.
18.75 J
4800 J
9000 J
Which of the following is correct about having light bulbs connected in series in a circuit?
The dry cell can last longer in a series circuit compared to a parallel circuit with the same type and number of light bulbs in the circuit.
If more light bulbs are added to the circuit in series, the light bulbs will become dimmer.
If one light bulb is spoilt, the rest of the light bulbs connected in series can still work.
The SI unit of potential difference is ....
watt (w)
volt (v)
ohm (Ω)
ampere (A)
How is the relation between current and resistance?
resistance increase, current increase
resistance stay the same, current decrease
resistance decrease, current increase
resistance increase, current stay the same
Which of the following is a symbol for variable resistor?
The S.I. unit for current is
(a)
In a series circuit, which of the following is the same throughout the circuit?
Resistance
Voltage
Current
Power
By convention, current is defined as flowing from ______________ to ______________.
positive, negative
positive, positive
negative, positive
negative, negative
Which instrument is shown in the picture?
voltmeter
ammeter
multimeter
thermometer
If the reading of A1 is 0.3 A, what is the reading of ammeter A2?
0.1 A
0.2 A
0.3 A
0.4 A
What is wrong with this circuit diagram?
There is only one cell
A ammeter should be connected in parallel
The ammeter should be connected in series
If you put more lamps into a series circuit, the lamps will be ____________than before.
brighter
dimmer
stays the same
In parallel circuit, the total resistance is ___________ the resistance of the individual resistors.
less than
more than
Which of the following is not an effect of magnetic effect of current?
electric kettle
electric bell
electric motor
magnetic crane
Which of the following electrical danger is due to the flow of large current?
overloading
short circuit
wet conditions
damaged wires
