Download Practice Unit Test - hhs-snc1d

SNC1D
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Practice Test on Electricity
/72 Knowledge and Understanding
Name:___________________
/5 Thinking and Inquiry
Part A: Multiple Choice Circle the best answer
1. In a conductor, the moving charges are
usually:
a) protons
b) electrons
c) neutrons
d) charges cannot move in a conductor
2. A series of dry cells connected together is
called a:
a) resistor
b) voltage
c) lamp
d) battery
3.
a)
b)
c)
d)
4.
a)
b)
c)
d)
A good example of an insulator:
salt water
iron
copper
plastic
The four basic components of a circuit are:
power source, lamps, resistors, batteries
wires, connectors, switches, lamps
power source, connectors, loads, switches
batteries, lamps, resistors, fuses
5. The invention of the voltaic cell is attributed
to:
a) Benjamin Franklin
b) Alessandro Volta
c) Guglielmo Marconi
d) Andre-Marie Ampere
6. A list of materials placed according to how
strongly they hold on to electrons is called:
a) the electrostatic series
b) the law of electrostatics
c) the electronic list
d) the law of electromagnetics
[20 KU]
7. The three methods of charging an object are:
a) contact, induction, friction
b) friction, contact, deduction
c) contact, induction, grounding
d) induction, friction, grounding
8. One kilowatt is equal to:
a) 1 Watt
b) 10 Watts
c) 100 Watts
d) 1000 Watts
9.
This is a measure of how much energy is
being used per unit of time:
a) current
b) voltage
c) power
d) resistance
10. A 480W computer is left on for 8 hours during
the day. The energy wasted is:
a) 8 Watt hours
b) 480 Watt hours
c) 60 Watt hours
d) 3840 Watt hours
11. The purpose of a fuse is:
a) to break a circuit if too much current is
passing through
b) to add resistance to a circuit
c) to make a battery less powerful
d) to make a short circuit
12.
a)
b)
c)
d)
The unit of energy is the:
Joule
Watt
Ohm
Ampere
13.
a)
b)
c)
d)
The symbol for charge is:
C
A
W
Q
14.
a)
b)
c)
d)
The symbol for the unit of charge is:
Q
C
I
A
15.
a)
b)
c)
d)
The unit for time is the:
Watt
Joule
metre
second
18. The common term for potential difference is:
a) current
b) voltage
c) resistance
d) energy
16. A circuit consists of a dry cell and two
unknown resistors in parallel. The current
through one resistor is:
a) equal to the current leaving the cell
b) equal to the current in the other resistor
c) less than the current leaving the cell
d) less than the current in the other resistor
Part B: Units
17. A circuit consist of a dry cell and two
resistors in series. The current through one
resistor is:
a) equal to the current going through the
other resistor
b) less than the current going through the
other resistor
c) less than the current going through the cell
d) more than the current going through the
cell
19. Given the formula V = E/Q, one volt is
equal to:
a) one Joule-Coulomb
b) one Joule per Ampere
c) one Joule per Coulomb
d) one Watt per Ampere
20. Given the formula E = P t, one Joule is
equal to:
a) one power-time
b) one Ampere per second
c) one Watt per Coulomb
d) one Watt-second
Fill in the following table:
[15 KU]
Measure
Symbol
Unit
Unit Symbol
Time
t
Second
s
Power
Joule
Ampere
R
Potential Difference
Part C: Word Problems For each problem, show your formula and all calculations. Make sure your final
answer includes units.
[21 KU]
1. A 940 Watt toaster is plugged into the 120V outlet in my kitchen.
a) How much current does it draw from the
b) How much energy will it use up if it takes
outlet? [3 KU]
40 seconds to toast bread?[3 KU]
2. A lamp has a resistance of 40Ω. Find the voltage loss in the lamp when 2.4A of current is
running through it.
[3 KU]
3. A current of 1.5A runs through a resistor in a circuit. A voltmeter reads a loss of 3.4V across the
resistor.
a) Find the resistance of the resistor.
b) Find the power loss of the resistor.
[3 KU]
[3 KU]
4. An oven coil plugged into a 240V power source has a resistance of 30Ω. Find the power of the
oven coil. [6 KU]
Part D: Diagrams
When calculating values, please show your formula, all calculations and units.
[16 KU, 5 TIPS]
1. Four lamps are connected in a circuit as shown below:
a) What would happen to the lamps if points A and B were connected with a wire?
[2 TIPS]
b) What do you call a wire that bypasses part of a circuit?
[1 KU]
2. Consider the following circuit:
[8 KU]
a) What kind of circuit is shown?
c) What is the voltage loss in R3?
b) Calculate the current running
through R2.
d) Calculate the current leaving the battery.
3. Draw a diagram or diagrams illustrating charging an object negatively by induction. Write a
short explanation of each step in the space on the right.
[6 KU]
Diagrams
Explanation
4. You are making toast when you realize your toast is stuck in the toaster. You get a fork to pry
out the toast from the toaster. As you pry the toast out, you get a nasty shock that damages
your hand.
a) Explain why you got a shock. Try to be as specific as possible.
[1 KU]
b) Give three ways that you could have prevented or lessened the shock and perhaps saved
your hand from damage.
[3 TIPS]