Multiple Choice (1 mark each)
Identify the letter of the choice that best completes the statement or answers the question.
____ 1. If 15 C passes a point in a circuit in 5.0 s, the current in the circuit is a) 75 A b) 3.0 A c) 0.33 A d) 15 A e) 5.0 A
____ 2. Which of these units is equal to one volt ? a) 1 J/s b) 1 J/C c) 1 C/s d) 1 C/J e) 1 J/C·s
____ 3. Which device would most likely be classified as a load in an electrical circuit? a) battery d) cell b) light bulb c) ammeter e) none of the above
____ 4. Kirchoff's law of voltages states that in a complete circuit, a) The sum of voltage decreases equals the sum of voltage increases. b) All paths in a circuit have equal voltage increases. c) All electrons must travel the same path. d) Electrons provide the necessary voltage for the circuit to operate. e) The voltage is equal to the energy divided by the current.
____ 5. Three 10.0-
Ω resistors are connected in parallel to one another in a 12.0-A circuit. The total resistance in the circuit is a) 0.0333
Ω b) 0.300
Ω c) 3.33
Ω d) 20.0 e) 30.0
Ω
Ω
____ 6. 3.0 kW·h is equivalent to a) 1.1
×
10
7
J b) 1.8
×
10
6
J c) 1.1
×
10
3
J d) 2.2
×
10 e) 0.83 J
2
J
Short Answer (2 marks each)
1. What is the difference between the direction of electric current and the direction of electron flow in a circuit?
2. Why are loads in a household circuit connected in parallel to the circuit, rather than in series?
Problem
1. An oven operates on a 15.0-A current from a 120-V source. How much energy will it consume in 3.0 h of operation? (3 marks)
2. How many 100-W light bulbs connected to a 120-V supply can be turned on at the same time without blowing a 15.0-A fuse? (4 marks)

3. A 125-V circuit contains a 10.0-
Ω
resistor. What resistance must be added in series for the circuit to have a current of 5.00 A? (4 marks)
4. In the following circuit, find the total resistance, R3, V2 and I4. (10 marks)
R1=9.0
Ω
R3 = ?
Vt=12V
It = 1.0A
R2=4.0
Ω
R5=36
Ω
R4=12
Ω
Practical (Answer all questions in the spaces below)
1. a) Record the colour bands on each of the resistors at your station:
Resistor 1_______________________________
Resistor 2_______________________________
Resistor 3_______________________________ b) Connect the resistors in parallel to the 6.0V connection on the power supply.
Measure the current and voltage through resistor 1 current = _______________ (2 marks) voltage = ______________ (2 marks) c)
Disconnect your circuit and return to your seat.
Using the table below, determine the resistance of resistor 1 using the colour bands.
R1 = ____________________________________________ (2 marks) black brown
0
1 yellow green
4
5 grey white
8
9
2
3 blue violet
6
7 gold silver
-1
-2 red orange
Using your current/voltage observations in 1b), determine the resistance of resistor 1.
R1 = _____________________________________________ (2 marks)
What is the %error in your measured resistance?

%error = __________________________________________ (2 marks)
What might account for your %error? Answer in the space below. (2 marks)

MULTIPLE CHOICE
1. ANS: B
2. ANS: B
3. ANS: B
4. ANS: A
5. ANS: C
6. ANS: A
REF: I
REF: C
REF: K/U
REF: K/U
REF: K/U
REF: C
OBJ: 12.3
OBJ: 12.4
OBJ: 12.5
OBJ: 12.5
OBJ: 12.6
OBJ: 12.7
LOC: EM1.01
LOC: EM1.01
LOC: EM1.01
LOC: EM1.01
LOC: EM1.01
LOC: EM1.01
SHORT ANSWER
1. ANS:
Electric current travels from the positive to the negative terminal of a source in a circuit. Electron flow travels in the opposite direction.
REF: K/U OBJ: 12.3 LOC: EM1.02
2. ANS:
Connecting in parallel allows each appliance to be turned on or off without interrupting the flow of current to the others. In a series circuit, if one appliance is turned off, the current would have no path to the others.
REF: MC OBJ: 12.5 LOC: EM1.01
PROBLEM
1. ANS:
I = 15.0 A
V = 120 V
∆
t = 3.0 h = 1.08
×
10
4
s
E = ?
The oven will use 1.9
××××
10
7
J of energy.
REF: I
2. ANS:
OBJ: 12.4 LOC: EM1.01

P n
= 100 W
V = 120 V
I = 15.0 A number of bulbs = ?
Eighteen bulbs can be turned on at once.
REF: MC
3. ANS:
V
T
= 125 V
I
T
R
1
= 5.00 A
= 10.0
Ω
R
2
= ?
OBJ: 12.7 LOC: EM1.01
A resistance of 14.0
Ω
must be added.
REF: I
4. ANS:
OBJ: 12.6 LOC: EM1.01

Therefore, Rt = 12
Ω
R3 = 3.0
,
Ω
,
V2 = 3.0V,
I4 = 0.75A
OTHER
1. ANS: a) b) c) R = V/I,
%error = (measured - accepted)x100%/accepted