Grade 11 Health: Electricity Challenge Practice Worksheet

Electricity Challenge Practice

Grade 11 Health Electricity Challenge Practice Advanced 25 Questions 23 Views

Classroom Worksheet

Grade 11 Health: Electricity Challenge Practice Worksheet

Electricity Challenge Practice

Name____________________________

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Score______ / 25

Grade: Grade 11

Subject: Health

Topic: Electricity

Time: 20 Minutes

Difficulty: Advanced

Questions: 25

Instructions:
Read each question carefully and answer in complete sentences when needed. Show your work for calculation questions. Use your knowledge of electrical safety, energy use, and the health effects of electricity in everyday life.

Skills Practiced:

Electricity
Health
Critical Thinking
Problem Solving

1Question

Define electricity in your own words.

2Question

Name two common forms of electricity used in homes and schools.

3Question

What is an electric current?

4Question

What unit is used to measure electric current?

5Question

What is voltage?

6Question

What unit is used to measure voltage?

7Question

What is resistance?

8Question

What unit is used to measure resistance?

9Question

State Ohm’s law.

10Question

A device uses 2 A of current at 12 V. What is its resistance?

11Question

A circuit has a resistance of 4 Ω and a current of 3 A. What is the voltage?

12Question

A lamp has a voltage of 9 V and a resistance of 18 Ω. What current flows through it?

13Question

Explain why dry hands are safer than wet hands when touching electrical equipment.

14Question

List two safety rules for using electrical appliances in a classroom or home.

15Question

Why are damaged cords dangerous?

16Question

What should you do first if someone is being shocked by an electrical source?

17Question

Explain the difference between a conductor and an insulator.

18Question

Give one example of a conductor and one example of an insulator.

19Question

Why are metals often used in electrical wiring?

20Question

A phone charger uses 20 W of power for 3 hours. How much energy does it use?

21Question

A heater uses 1500 W and runs for 2 hours. How much energy does it use in watt-hours?

22Question

Explain why overloading a circuit can be dangerous.

23Question

Why might a circuit breaker trip during a power surge or overload?

24Question

Describe two health risks of electrical accidents.

25Question

A student notices a classroom extension cord running under a carpet, with several devices plugged into one outlet strip. Analyze the safety concerns and give two improvements.

Answer Key

#	Answer
1	Electricity is the movement of electric charge through a material or space.
2	AC (alternating current) and DC (direct current).
3	Electric current is the flow of electric charge, usually through a wire.
4	Ampere (A).
5	Voltage is the difference in electrical potential that pushes electric charges through a circuit.
6	Volt (V).
7	Resistance is the opposition to the flow of electric current in a circuit.
8	Ohm (Ω).
9	Ohm’s law states that voltage equals current multiplied by resistance: V = IR.
10	R = V / I = 12 / 2 = 6 Ω.
11	V = IR = 3 × 4 = 12 V.
12	I = V / R = 9 / 18 = 0.5 A.
13	Dry skin has higher resistance, so less current can flow through the body. Wet skin lowers resistance and increases the risk of shock.
14	Examples: do not overload outlets; keep water away from electricity; unplug by holding the plug, not the cord; report damaged wires immediately.
15	Damaged cords can expose live wires, causing electric shock, burns, or a fire hazard.
16	Do not touch the person directly; turn off the power source if safe to do so and get adult or emergency help immediately.
17	A conductor allows electric current to flow easily, while an insulator resists the flow of current.
18	Conductor: copper. Insulator: rubber.
19	Metals conduct electricity well and allow current to flow efficiently with relatively low resistance.
20	Energy = power × time = 20 × 3 = 60 Wh.
21	Energy = 1500 × 2 = 3000 Wh.
22	Overloading a circuit causes too much current to flow, which can overheat wires, damage appliances, and possibly start a fire.
23	A circuit breaker trips to stop excessive current and protect the wiring and appliances from damage or fire.
24	Possible risks include burns, muscle contractions, nerve damage, heart rhythm problems, and falls caused by shock.
25	Safety concerns include overheating, hidden cord damage, and overload from too many devices. Improvements: move the cord so it is visible and not under a carpet, and reduce the number of plugged-in devices or use an approved power strip/circuit with proper capacity.