Grade 8 Robotics Worksheet: Electricity (Mixed Practice)

Electricity Mixed Practice

Grade 8 Robotics Electricity Mixed Practice Challenging 40 Questions 21 Views

Classroom Worksheet

Grade 8 Robotics Worksheet: Electricity (Mixed Practice)

Electricity Mixed Practice

Name____________________________

Date________________

Score______ / 40

Grade: Grade 8

Subject: Robotics

Topic: Electricity

Time: 20 Minutes

Difficulty: Challenging

Questions: 40

Instructions:
Answer each question in complete sentences when needed. Show your work for calculations. Use correct units and scientific vocabulary. Questions start with basic ideas and become more challenging.

Skills Practiced:

Electricity
Robotics
Critical Thinking
Problem Solving

1Question

What is electricity?

2Question

Name the two types of electric charge.

3Question

What particle in an atom has a negative charge?

4Question

What particle in an atom has a positive charge?

5Question

What does current measure in a circuit?

6Question

What unit is used to measure electric current?

7Question

What does voltage measure in a circuit?

8Question

What unit is used to measure voltage?

9Question

What does resistance do in a circuit?

10Question

What unit is used to measure resistance?

11Question

State Ohm’s Law.

12Question

If a circuit has a voltage of 6 V and a resistance of 3 Ω, what is the current?

13Question

If a circuit has a current of 4 A and a resistance of 5 Ω, what is the voltage?

14Question

If a circuit has a voltage of 12 V and a current of 3 A, what is the resistance?

15Question

What is a conductor?

16Question

What is an insulator?

17Question

Give one example of a conductor used in robotics.

18Question

Give one example of an insulator used in robotics.

19Question

What is a circuit?

20Question

Why must a circuit be closed for current to flow?

21Question

What is the difference between a series circuit and a parallel circuit?

22Question

Which type of circuit is usually better for home wiring or robots that need parts to work independently?

23Question

What happens to the total resistance in a series circuit when more resistors are added?

24Question

What happens to the current in a series circuit if one component breaks?

25Question

What is electrical power?

26Question

What unit is used to measure electrical power?

27Question

Use the formula P = VI. If a motor uses 9 V and 2 A, what is the power?

28Question

Use the formula P = VI. If a device uses 12 V and 0.5 A, what is the power?

29Question

A robot sensor has a resistance of 8 Ω and current of 1.5 A. What is the voltage across it?

30Question

A battery provides 24 V to a circuit with 6 Ω resistance. What is the current?

31Question

A robot’s LED uses 3 V and 20 mA. Convert the current to amperes.

32Question

A robot’s LED uses 3 V and 20 mA. Find the power in watts.

33Question

Why is a fuse or circuit breaker useful in a robot or electrical system?

34Question

What does a switch do in a circuit?

35Question

Why are batteries useful in mobile robots?

36Question

A robot has two identical resistors of 10 Ω each in series. What is the total resistance?

37Question

A robot has two identical resistors of 10 Ω each in parallel. Which statement is correct: the total resistance is greater than, less than, or equal to 10 Ω?

38Question

A circuit has a current of 2 A for 30 seconds. How much charge passes through the circuit? Use Q = It.

39Question

A robot arm uses 36 W of power for 5 minutes. How much energy does it use in joules? Use E = Pt and convert minutes to seconds.

40Question

A robot motor runs on 12 V and draws 1.5 A. The battery capacity is 6 Ah. About how many hours can the battery power the motor if conditions stay the same?

Answer Key

#	Answer
1	Electricity is the movement or flow of electric charge through a material or circuit.
2	Positive charge and negative charge.
3	An electron.
4	A proton.
5	Current measures the rate at which electric charge flows.
6	Amperes, abbreviated as A.
7	Voltage measures the electric potential difference or energy per charge.
8	Volts, abbreviated as V.
9	Resistance opposes or reduces the flow of current.
10	Ohms, abbreviated as Ω.
11	Voltage equals current times resistance: V = IR.
12	I = V ÷ R = 6 ÷ 3 = 2 A.
13	V = IR = 4 × 5 = 20 V.
14	R = V ÷ I = 12 ÷ 3 = 4 Ω.
15	A conductor is a material that allows electric current to flow easily.
16	An insulator is a material that resists the flow of electric current.
17	Copper wire is one example.
18	Plastic wire coating is one example.
19	A circuit is a complete path that allows electric current to flow.
20	Because current needs a complete path from the power source and back again.
21	In a series circuit there is one path for current; in a parallel circuit there are multiple paths.
22	A parallel circuit.
23	The total resistance increases.
24	The current stops everywhere because the circuit opens.
25	Electrical power is the rate at which electrical energy is used or transferred.
26	Watts, abbreviated as W.
27	P = 9 × 2 = 18 W.
28	P = 12 × 0.5 = 6 W.
29	V = IR = 1.5 × 8 = 12 V.
30	I = V ÷ R = 24 ÷ 6 = 4 A.
31	20 mA = 0.02 A.
32	P = VI = 3 × 0.02 = 0.06 W.
33	It protects the circuit by stopping current if it becomes too high.
34	A switch opens or closes a circuit to stop or allow current flow.
35	They provide portable electrical energy without needing a wall outlet.
36	10 Ω + 10 Ω = 20 Ω.
37	The total resistance is less than 10 Ω.
38	Q = 2 × 30 = 60 coulombs.
39	5 minutes = 300 s. E = 36 × 300 = 10,800 J.
40	Time = capacity ÷ current = 6 Ah ÷ 1.5 A = 4 hours.