WorksheetsElectric Circuit (Grade 9)
Total questions: 56
Worksheet time: 41mins
Name
Class
Date
1.
Your phone charger uses a current of 2 A and operates at 5 V. What is the power consumption?
a)
5 W
b)
10 W
c)
7 W
d)
2.5 W
e)
12 W
2.
A student connects two 6 Ω resistors in series. What is the total resistance?
(a)
3.
In a parallel circuit with three identical bulbs what happens if one bulb breaks?
a)
All go off
b)
Remaining bulbs get brighter
c)
Nothing changes
d)
Only one bulb goes off
e)
Others stay on
4.
Your classroom has 4 identical fans connected in parallel to a 220 V supply. Each fan uses 0.5 A. What is the total current drawn?
a)
0.5 A
b)
1 A
c)
2 A
d)
4 A
e)
220 A
5.
A 12 V battery powers a circuit with a total resistance of 4 Ω. What is the current?
a)
3 A
b)
4 A
c)
2 A
d)
1 A
e)
6 A
6.
Which of these appliances is most likely to use a parallel circuit?
a)
Flashlight
b)
String of fairy lights
c)
Home lighting system
d)
Electric kettle
e)
Phone charger
7.
A student connects three 2 Ω resistors in series. What is the total resistance?
(a)
8.
In a series circuit what happens to the current as it passes through each component?
a)
It increases
b)
It decreases
c)
It stays the same
d)
It reverses
e)
It splits
9.
You plug in a power strip with multiple devices. What type of circuit is inside the strip?
a)
Series
b)
Parallel
c)
Mixed
d)
Short circuit
e)
Open circuit
10.
A 9 V battery powers a circuit with 3 Ω resistance. What is the current?
a)
3 A
b)
6 A
c)
9 A
d)
27 A
e)
0.33 A
11.
Which material is the best conductor in a circuit?
a)
Plastic
b)
Wood
c)
Copper
d)
Glass
e)
Rubber
12.
A student connects two 4 Ω resistors in parallel. What is the total resistance?
a)
8 Ω
b)
2 Ω
c)
4 Ω
d)
1 Ω
e)
0.5 Ω
13.
What happens to total resistance when more resistors are added in series?
a)
It decreases
b)
It stays the same
c)
It increases
d)
It becomes zero
e)
It fluctuates
14.
What happens to total resistance when more resistors are added in parallel?
a)
It increases
b)
It decreases
c)
It stays the same
d)
It becomes infinite
e)
It fluctuates
15.
A 60 W bulb operates at 120 V. What is the current?
a)
0.5 A
b)
2 A
c)
1 A
d)
0.25 A
e)
3 A
16.
A student connects a 3 Ω and 6 Ω resistor in series. What is the total resistance?
a)
9 Ω
b)
3 Ω
c)
6 Ω
d)
2 Ω
e)
18 Ω
17.
A student connects a 3 Ω and 6 Ω resistor in parallel. What is the total resistance?
a)
9 Ω
b)
2 Ω
c)
6 Ω
d)
1 Ω
e)
3 Ω
18.
What is the voltage across each branch in a parallel circuit with a 12 V battery?
a)
12 V
b)
6 V
c)
4 V
d)
3 V
e)
0 V
19.
Which circuit type allows each device to operate independently?
a)
Series
b)
Parallel
c)
Short circuit
d)
Mixed circuit
e)
Open circuit
20.
A 100 W lamp is used for 2 hours. How much energy is consumed?
a)
200 J
b)
200 W
c)
200 Wh
d)
100 Wh
e)
2 kWh
21.
Which fuse rating is best for a device using 3 A current?
a)
1 A
b)
2 A
c)
3 A
d)
5 A
e)
10 A
22.
What happens to current in a parallel circuit?
a)
It stays the same
b)
It splits
c)
It reverses
d)
It stops
e)
It increases
23.
What happens to current in a series circuit?
a)
It splits
b)
It increases
c)
It stays the same
d)
It reverses
e)
It stops
24.
A 240 V appliance draws 2 A. What is its power?
a)
480 W
b)
120 W
c)
240 W
d)
2 W
e)
1200 W
25.
Which of these is a disadvantage of series circuits?
a)
Simple wiring
b)
Independent control
c)
Lower resistance
d)
One fault breaks all
e)
Equal brightness
26.
Which of these is an advantage of parallel circuits?
a)
Lower voltage
b)
Higher resistance
c)
Independent control
d)
Single path
e)
All devices off together
27.
A 5 Ω resistor and a 10 Ω resistor are connected in parallel. What is the total resistance?
a)
15 Ω
b)
5 Ω
c)
10 Ω
d)
3.33 Ω
e)
7.5 Ω
28.
A 5 Ω resistor and a 10 Ω resistor are connected in series. What is the total resistance?
a)
15 Ω
b)
5 Ω
c)
10 Ω
d)
3.33 Ω
e)
7.5 Ω
29.
Which of these is a electric conductor?
a)
Plastic
b)
Glass
c)
Copper
d)
Rubber
e)
Wood
30.
Which of these is an electric insulator?
a)
Copper
b)
Aluminum
c)
Iron
d)
Plastic
e)
Silver
31.
A 60 W bulb is used for 5 hours. How much energy is used?
a)
300 Wh
b)
60 Wh
c)
120 Wh
d)
5 Wh
e)
600 Wh
32.
What is the unit of resistance?
a)
Volt
b)
Ampere
c)
Watt
d)
Ohm
e)
Joule
33.
What is the unit of current?
a)
Volt
b)
Ampere
c)
Watt
d)
Ohm
e)
Joule
34.
What is the unit of voltage?
a)
Volt
b)
Ampere
c)
Watt
d)
Ohm
e)
Joule
35.
What is the unit of power?
a)
Volt
b)
Ampere
c)
Watt
d)
Ohm
e)
Joule
36.
What is the unit of energy?
a)
Volt
b)
Ampere
c)
Watt
d)
Ohm
e)
Joule
37.
Which formula represents Ohm’s Law?
a)
V = I × R
b)
I = V × R
c)
R = V × I
d)
P = V × R
e)
E = V × I
38.
Which formula calculates power?
a)
P = V × I
b)
P = I/R
c)
P = V/R
d)
P = R × I
e)
P = V/I
39.
Which formula calculates energy?
a)
E = P × t
b)
E = V × I
c)
E = I × R
d)
E = V/R
e)
E = R × I
40.
Which formula calculates resistance in series?
a)
R = R1 + R2
b)
R = R1 × R2
c)
R = R1/R2
d)
R = R1 – R2
e)
R = R1 + R2 + R3
41.
Which formula calculates resistance in parallel?
a)
1/R = 1/R1 + 1/R2
b)
R = R1 + R2
c)
R = R1 × R2
d)
R = R1 – R2
e)
R = R1/R2
42.
Which of these is true about series circuits?
a)
Voltage is same across all components
b)
Current splits
c)
Current is same everywhere
d)
Each branch gets full voltage
e)
Each device works independently
43.
Which of these is true about parallel circuits?
a)
Voltage splits
b)
Current is same everywhere
c)
Current stops
d)
Voltage is same across branches
e)
All devices go off together
44.
A 12 V battery powers two 6 Ω resistors in series. What is the current?
a)
1 A
b)
2 A
c)
0.5 A
d)
3 A
e)
6 A
45.
A 12 V battery powers two 6 Ω resistors in parallel. What is the current?
a)
1 A
b)
4 A
c)
0.5 A
d)
3 A
e)
6 A
46.
Which of these is a real-life example of a parallel circuit?
a)
Flashlight
b)
Christmas lights
c)
Home sockets
d)
Electric bell
e)
Bicycle light
47.
Which of these is a real-life example of a series circuit?
a)
Home sockets
b)
Phone charger
c)
Old Christmas lights
d)
Laptop charger
e)
Wall outlet
48.
None
a)
Resistor
b)
Transistor
c)
Wave meter
d)
Switch
e)
Relay
49.
a)
Wire
b)
Battery
c)
Buzzer
d)
Fuse
50.
This is the symbol for a _____?
a)
an AC current source
b)
a DC current source
c)
a battery
d)
a single cell
51.
This is the symbol for a _____?
a)
an AC current source
b)
a DC current source
c)
a battery
d)
a single cell
52.
This is the symbol for a _____?
a)
an AC current source
b)
a DC current source
c)
an ammeter
d)
a voltmeter
53.
This is the symbol for a _____?
a)
an AC current source
b)
a DC current source
c)
an ammeter
d)
a voltmeter
54.
what is this?
a)
Battery
b)
Motor
c)
Fixed resistor
d)
Fuse
55.
what does this symbol represent?
a)
Lamp
b)
Buzzer
c)
Switch
d)
Transistor
56.
What does this symbol represent?
a)
Diode
b)
Capacitor
c)
Transistor
d)
Resistor
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