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WorksheetsElectric circuits
Total questions: 25
Worksheet time: 16mins
Name
Class
Date
1.
Which way does the current flow when switch is closed.
a)
Clockwise
b)
anti-clockwise
2.
What is the symbol and unit for Charge
a)
C, Coulomb
b)
I, Ampere
c)
Q, Coulomb
d)
W, Ampere-Hour
3.
What type of circuit is this ?
a)
Series
b)
Parallel
4.
What is 10.5kV in volts ?
a)
1050V
b)
105V
c)
10500V
d)
0.0105V
5.
Which one is Ohm's Law
a)
The current is directly proportional to voltage
b)
The current is indirectly proportional to the voltage
c)
The current is directly proportional to the voltage providing temperature remains constant
d)
V=IR
6.
Which one is an Ohmic Conductor
a)
1st one
b)
2nd one
c)
3rd one
d)
All of them
7.
The rate of change of charge is ....
a)
Energy
b)
Current
c)
Voltage
d)
Resistance
8.
Name the symbol
a)
Diode
b)
LDR
c)
Thermistor
d)
LED
9.
Name the symbol
a)
Battery
b)
Cell
c)
Duracell
d)
Power source
10.
Calculate the current when the potential difference is 10V and resistance is 2Ω
a)
5mA
b)
5A
c)
20A
d)
0.2A
11.
What is the charge when a current of 10A flows in a resistor for 2 minutes.
a)
20J
b)
5A
c)
1200C
d)
20C
12.
Resistance is how .....
a)
easy it is for electrons or charge to flow
b)
difficult it is for electrons or charge to flow
c)
the flow of current
d)
much energy is lost as heat
13.
What is the total resistance
a)
20V
b)
0.8Ω
c)
25Ω
d)
1.2Ω
14.
The resistance of a conductor is down to...
a)
The collisions of atoms with electrons
b)
The collision of electrons with electrons
c)
The collision of electrons with metal ions
d)
The temperature of the conductor
15.
In a semiconductor the resistance falls when it is heated. This is because...
a)
the heat energy cause more metal ions to vibrate
b)
the heat energy allows more electrons to become free from their atoms.
c)
there is a decrease in metal ions.
d)
the metal ions vaporise from the semiconductor.
16.
If A1 has a current of 2A flowing then A3 will be
a)
4A
b)
0.5A
c)
2A
d)
6A
17.
What is the missing current ?
a)
0.33 A
b)
1A
c)
2A
d)
3A
18.
What happens when the middle bulb blows ?
a)
All bulbs go out
b)
The first stays on
c)
The remaining bulb stay on
d)
The last bulb stays on
19.
What is the voltage across V2 if voltage across V1 is 5V
a)
5V
b)
5J
c)
4V
d)
9V
20.
What is the voltage across the 5Ω lamp ?
a)
60 A
b)
60V
c)
90V
d)
30V
21.
What is the meter on the lamp acting as
a)
Ohmmeter
b)
Ammeter
c)
Voltmeter
d)
Thermometer
22.
What is the current through the 20Ω resistor
a)
0.6A
b)
0.3C
c)
6V
d)
0.3A
23.
What is the current flowing out of the cell ?
a)
0.3A
b)
0.9A
c)
0.6A
d)
30A
24.
If the LDR is connected parallel to the bulb when will the bulb switch on
a)
When it is day/light
b)
When it is night/dark
c)
Neither
d)
Both
25.
Calculate the energy when a transformer of 10kV delivers a current of 30mA for 5 mins
a)
60V
b)
9kJ
c)
15kJ
d)
600mV
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