SNC 1P1
Date: ________________
Electrical Applications Review
1. State the three laws of electric charges.
2. Use the words proton, electron, neutron, or none to answer the following
questions:
a. What part(s) of an atom are positive?
_________
b. What part(s) of an atom orbit the nucleus?
_________
c. What part(s) of an atom cannot be easily lost or gained?
_________
d. What part(s) of an atom can be found in the nucleus?
_________
e. What part(s) of an atom is present in the largest amount in a negatively
charged atom?
_________
f. What part(s) of an atom can be transferred easily?
_________
3. Which of the following words best describes the following situations?
Attract, Repel, Nothing Occurs
a. Two negatively charged objects approach each other.
______________
b. Two positively charged objects approach each other.
c.
d.
e.
f.
______________
A negatively charged object approaches a neutral object.
______________
A negatively charged object approaches a positively charged object.
______________
Two neutral objects approach each other.
______________
A positively charged object approaches a neutral object.
______________
4. Complete the diagrams to show how an uncharged pith ball will become charged
when a negatively charged ebonite rod touches it.
Before contact
After contact
5. Use the electrostatic series to explain the following questions.
Electrostatic Series
A glass rod is rubbed with silk, both the glass rod and
acetate
the silk become charged.
glass
a. What charge forms on the glass rod?
wool
b. What charge forms on the silk?
c. How do the two substances become charged
(use a diagram)?
fur, hair
calcium, magnesium, lead
silk
aluminum, zinc
cotton
paraffin wax
ebonite
plastic
carbon, copper, nickel
rubber
sulphur
platinum
gold
6. Explain what grounding is.
7. Explain the difference between electrical conductors and insulators.
8. Name and provide an example of the four components of a basic electrical
circuit.
9. Complete the following by drawing the appropriate symbol beside each electric
circuit component.
Name
Symbol
Name
1-cell battery
3-cell battery
Open switch
Ammeter
Closed switch
Voltmeter
Light bulb
Motor
Symbol
10. Draw a series circuit with a 1-cell battery, 2 lights, an open switch, and an
ammeter closest to the negative terminal.
What will happen if one of the lights is unscrewed?
11. Draw a 3-cell battery and 3 lights wired in parallel. Add an open switch to
control the entire circuit, and 3 open switches to control each light separately.
Add an ammeter to measure the current in the whole circuit, and a voltmeter to
measure the potential difference around one light.
What will happen if all switches are closed and one of the lights is unscrewed?
12. What happens to the brightness of a light when more lights are added in series?
13. Why should the appliances in your home not be wired in series? Explain your
answer.
14. Define the following:
a. Electric Current
b. Potential Difference (Voltage)
c. Resistance
15. List four factors that affect resistance.
16. If your friend is under an electric shock, list the proper steps to rescue them.
17. List and describe 3 safety devices in electric circuits.
18. Complete the following table.
Energy
Describe
Source
Fossil Fuels
Nuclear Energy
HydroElectricity
Wind
Solar
Advantage
Disadvantage
19. Describe the difference between renewable energy sources and non-renewable
energy sources.
20. The unit of electrical energy is ________________ and ________________.
The unit of power is _________________.
21. What is the equation to calculate the cost of electricity?
What unit should each variable be in?
22. Convert 250 W to kW.
23. A machine is on for 5 hours a day. It uses 1500 W. If the cost of electricity is
$0.15 per kilowatt hour, how much will it cost to operate for 30 days?
24. Describe 4 ways you can conserve energy around your home.