Grade 8 STEM Worksheet: Electricity Assessment Prep

Electricity Assessment Prep

Grade 8 STEM Electricity Assessment Prep Medium 25 Questions 8 Views

Classroom Worksheet

Grade 8 STEM Worksheet: Electricity Assessment Prep

Electricity Assessment Prep

Name____________________________

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Score______ / 25

Grade: Grade 8

Subject: STEM

Topic: Electricity

Time: 20 Minutes

Difficulty: Medium

Questions: 25

Instructions:
Read each question carefully and answer in complete sentences when needed. Show your work for calculation questions. The questions start with basic ideas and become more challenging.

Skills Practiced:

Electricity
STEM
Critical Thinking
Problem Solving

1Question

What is electricity?

2Question

What particle carries a negative electric charge?

3Question

What do we call a path that allows electric current to flow?

4Question

What device provides electrical energy to a circuit?

5Question

What is the difference between a conductor and an insulator?

6Question

Name one common conductor used in household wiring.

7Question

Name one common insulator used around electrical wires.

8Question

What happens to a bulb in a simple circuit if the circuit is open?

9Question

What is current measured in?

10Question

What is voltage measured in?

11Question

What is resistance measured in?

12Question

Use Ohm’s law to find the current: V = 12 V and R = 4 Ω.

13Question

Use Ohm’s law to find the voltage: I = 2 A and R = 5 Ω.

14Question

Use Ohm’s law to find the resistance: V = 9 V and I = 3 A.

15Question

If two identical batteries are connected in series, what happens to the total voltage compared with one battery?

16Question

What is one advantage of a parallel circuit in a home?

17Question

In a series circuit, what happens to the current at different points in the circuit?

18Question

A circuit has a current of 4 A and a resistance of 2 Ω. What is the voltage?

19Question

A circuit has a voltage of 18 V and a current of 3 A. What is the resistance?

20Question

What happens to the current in a circuit if the resistance increases and the voltage stays the same?

21Question

Why can a wet surface be dangerous near electrical devices?

22Question

Explain why a fuse is used in an electrical circuit.

23Question

A student adds another bulb in series to a working circuit. What is likely to happen to the brightness of the bulbs?

24Question

A wire has a resistance of 8 Ω. If the voltage across it is 24 V, calculate the current and explain your steps.

25Question

Compare series and parallel circuits. Which type is better for wiring a classroom, and why?

Answer Key

#	Answer
1	Electricity is the movement of electric charge.
2	An electron.
3	A circuit.
4	A battery or power source.
5	A conductor allows electric current to flow easily, while an insulator resists the flow of current.
6	Copper.
7	Plastic.
8	The bulb will not light because the circuit is broken.
9	Amperes, or amps (A).
10	Volts (V).
11	Ohms (Ω).
12	I = V ÷ R = 12 ÷ 4 = 3 A.
13	V = I × R = 2 × 5 = 10 V.
14	R = V ÷ I = 9 ÷ 3 = 3 Ω.
15	The total voltage increases and is the sum of the two battery voltages.
16	If one device stops working, the others can still operate.
17	The current stays the same at all points in the circuit.
18	V = I × R = 4 × 2 = 8 V.
19	R = V ÷ I = 18 ÷ 3 = 6 Ω.
20	The current decreases.
21	Water can help conduct electricity, increasing the risk of electric shock.
22	A fuse protects the circuit by breaking the connection if the current becomes too high.
23	The bulbs will likely become dimmer because the resistance increases and the current decreases.
24	I = V ÷ R = 24 ÷ 8 = 3 A.
25	Parallel circuits are better for wiring a classroom because each device gets its own path, so if one device fails, the others keep working and devices can operate independently.