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Electricity & Circuits 2020 (Notes Companion)

Total questions: 37

Worksheet time: 9hrs 15mins

Name
Class
Date
1.

Atoms are composed of protons, neutrons & __________. (3)

a)

isotopes

b)

cations

c)

electrons

d)

moles

2.

What makes up everything? (4)

a)

protons

b)

electrons

c)

neutrons

d)

atoms

3.

Which of the following relate to static electricity (choose all that apply) (5)

a)

rubbing a wand across a rabbit skin

b)

sliding your shoe across carpet

c)

some atoms hold electrons tighter than others

d)

object building up a temporary charge due to excess e-s

4.

Static electricity is actually a/an ___________ in the amounts of positive and negative charges in the surface of an object. .(7)

a)

balance

b)

imbalance

5.

The ways to induce a charge in an object (choose all that apply). (9)

a)

conduction

b)

friction

c)

induction

6.

Charging by Induction is when an object charges another object __________________________. (10-13)

a)

by direct contact

b)

without direct contact

c)

by building up friction with the object

7.

Charging by conduction is when an object charges another object __________________________. (10-13)

a)

by direct contact

b)

without direct contact

c)

by building up friction with the object

8.

Charging by friction is when an object charges another object __________________________. (10-13)

a)

by direct contact

b)

without direct contact

c)

by building up friction with the object

9.

What device can detect electrical charge? (15)

a)

electroscope

b)

electromagnet

c)

simple magnet

d)

stethoscope

10.

Current..._________________. (17)

a)

the grouping of electrons

b)

the loss of electrons

c)

the flow of electrons

d)

the conversion of electrons

11.

These materials do not allow electrical charge to flow freely. (16)

a)

conductors

b)

insulators

c)

semiconductors

12.

These materials allows electrical charge to flow freely. (16)

a)

conductors

b)

insulators

c)

semiconductors

13.

These materials naturally do not allow electrical flow, but with added materials do allow electron flow. (16)

a)

conductors

b)

insulators

c)

semiconductors

14.

Which of the following materials would be good insulators?(choose all appropriate answers) (17)

a)

iron

b)

glass

c)

copper

d)

dry air

e)

wood

15.

Which of the following materials would be good conductors?(choose all appropriate answers) (17)

a)

iron

b)

glass

c)

copper

d)

dry air

e)

wood

16.

For VOLTAGE... (choose all that apply). (18-19)

a)

it's electrical pressure

b)

electrons flow from high voltage to lower voltage

c)

quatity is measured in volts (V)

d)

the voltage determines the system's current

e)

the push that causes electrons to move

17.

Current is measured in the unit ____________. (20-22)

a)

amps (A)

b)

beaurrents (Bu)

c)

coulombs (C)

d)

ohms (Ω)

18.

(True of False) Current is a measure of the number of electrons flowing through wire/material per a period of time. (20-22)

a)

true

b)

false

19.

Choose all of the following statements that are true. (20-22)

a)

Direct current flows in one direction

b)

Direct current flows in more than one direction

c)

Alternating current flows in one direction

d)

Alternating current flows in more than one direction

e)

Alternating current flows in alternating directions

20.

Which of the following statements about resistance are true? (23-25)

a)

Conductors are often used to increase resistance

b)

Resistance is the tendency to resist the flow of electrons

c)

Ohms are the unit used to measure resistance

d)

Copper is a material that can be used to reduce resistance

e)

A thicker wire will have more resistance than a thin wire

21.

Resistance produces a loss of energy. Which of the following would provide the least resistance? (23-25)

a)

A thick fiber made of glass

b)

A thick wire made of copper

c)

A thin fiber made of glass

d)

A thin wire made of copper

22.

Which of these is not a variation of Ohm's Law? (26)

a)

V=IR

b)

I=VR

c)

I=V/R

d)

R=V/I

23.

___________, the pathway for electrons to flow. (27)

a)

Voltage

b)

Current

c)

Circuit

d)

Resistance

24.

Which of these are parts of a electrical circuit? (choose all of the correct answers) (28)

a)

electrical plugs

b)

energy source (power supply)

c)

load (light bulb)

d)

switch

e)

wire

25.

Is this circuit open or closed? (29)

a)

open

b)

closed

26.

Is the attached diagram for a Series or Parallel Circuit? (31-33)

a)

Series

b)

Parallel

27.

Is the attached diagram for a Series or Parallel Circuit? (31-33)

a)

Series

b)

Parallel

28.

Is the attached diagram for a Series or Parallel Circuit? (31-33)

a)

Series

b)

Parallel

29.

Is the attached diagram for a Series or Parallel Circuit? (31-33)

a)

Series

b)

Parallel

30.

A battery consists of the following (choose all that apply). (34)

a)

anode

b)

cathode

c)

electrolyte

31.

Which of the following best explains why a broken light bulb fails to provide light? (35)

a)

With a broken bulb, the circuit is closed and fails to provide light

b)

With a broken bulb, the circuit is open and fails to provide light

32.

For power delivered to your home, what does the transformer on the light pole near your home do? (36)

a)

Steps up the voltage

b)

Steps down the voltage

c)

Measures to confirm delivered voltage

33.

Joule's Law is used to calculate electrical power. Provide the formula for this Law. (37)

a)

P=VC

b)

I=PC

c)

P=IV

d)

I=PV

34.

To calculate a kilowatt hour, multiply the watts by the time collected in hours and divide by ______________. (38)

a)

current

b)

voltage

c)

resistance

d)

1000

35.

40 volts powers a tool that has a current of 20 amps. What is the power used in kilowatts? (39)

a)

0.5 kW

b)

0.8 kW

c)

20 kW

d)

800 kW

36.

If a tool uses 0.8 kilowatts, how much energy (in kilowatt hours) is used when this tool is used for 8 hours a day for 5 days (39)

a)

3.2 kWh

b)

62.4 kWh

c)

32 kWh

d)

624 kWh

37.

If the power company charges 5¢/kWh, what is the cost of 500 kWh?

a)

1 dollar

b)

25 dollars

c)

100 dollars

d)

2500 dollars

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