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PSC-4011-2—w/ Yaw--------------------------------------------------------------quiz -------------------------------------------------------------------------Electricity (2-5)
Name:
Date:
1. State the truth value of the followings(true(T) or false(F))
True or False
Statement
a
Electrons flow from positive to negative terminal of the power supply.
b
d
If the electromotive force powering the circuit is increased, the resistance will also
increase
The voltage difference between the ends of a power source represents the energy
loss experienced by the charges flowing through them
Resistance is inversely proportional to temperature in a semi conductor
e
The humidity of your skin can influence your reaction to an electric shock.
f
It is absolutely safe to fill an iron with water without first unplugging it.
g
h
The danger associated to inserting a metal utensil into a plugged-in toaster is an old
wives’ tale.
The lower the AWG number the lower the current that can pass through the wire.
i
With alternating current, you have to touch two electric conductors to get a shock.
j
The distribution panel has 3 bus bars which correspond to the 3 wires with different
potentials.
k
The main contains only two live wires.
l
The voltaic cell was composed of silver, wet cardboard and Zincs
m
The Power of an electric generator can be increased by increasing the rotation of the
conductor coil in the magnetic field.
n
Rotor is the rotating part of a generator.
o
In an electric motor, the mechanical rotation of the conductor coil in the magnetic
field produces an electromotive force in the coil.
p
The stationary part of an electric motor is called the stator.
q
An electric motor converts rotational mechanical energy into electricity:
c
Yaw D. A -Saint Laurent Adult Centre-2012-13
PSC-4011-2—w/ Yaw--------------------------------------------------------------quiz -------------------------------------------------------------------------Electricity (2-5)
2. Given that the body’s resistance is 500 Ωcalculate the shock current experienced by a
person who touches a live wire at 120 V if the contacts total 50 000 Ω.
3. Complete the following table about the different types of cells.
Type of battery
Possible application
Important characteristic(s)
Alkaline Cell(1.5V)
Smoke detectors, cameras
1.
2.
Nickel-Cadmium (1.3V)
Cameras, cell phones
-Rechargeable
-Delivers a strong current for a short time
-Easily maintained
3.
4.
Car batteries
5.
4. At the AC voltage of 120 V provided by Hydro-Quebec.
a. What current intensity does a 40-W light bulb require?
b. How many 40-W bulbs could be connected on a 15-A general-purpose branch
circuit?
Yaw D. A -Saint Laurent Adult Centre-2012-13
PSC-4011-2—w/ Yaw--------------------------------------------------------------quiz -------------------------------------------------------------------------Electricity (2-5)
5. Cloth-dryer and electric range.
a. Why do clothes-dryer and electric range outlets have four holes?
a. Draw a distribution panel, an electric range outlet, a cloth dryer outlet and
complete the electric-range circuit and the cloth-dryer circuit
6. Ground or Earth.
a. What characteristic is common to all appliances with three prong plugs?
b. What characteristic is common to appliances with two prong plugs?
Yaw D. A -Saint Laurent Adult Centre-2012-13
PSC-4011-2—w/ Yaw--------------------------------------------------------------quiz -------------------------------------------------------------------------Electricity (2-5)
7. Given that all the resistance of each device in the circuit below is different, indicate
whether the following statements are true or false.
8. A lightning rod is usually a long metal rod placed on the roof of a building and connected
to ground by a conducting wire buried in the ground. Explain how it can protect a
building against lightning.
9. After combing her afro (long hair) for some time, Merlin notices that his comb is able to
lift a piece of paper and keep it hanging for a while. Using the knowledge acquired in
this module of physical science, explain what is going on.
Yaw D. A -Saint Laurent Adult Centre-2012-13
PSC-4011-2—w/ Yaw--------------------------------------------------------------quiz -------------------------------------------------------------------------Electricity (2-5)
10. Using the right-hand rule, draw an arrow (up or down) to indicate the direction of the
current flowing through the coil of wire below.
11. Using the right-hand rule, determine the direction of the field lines of the
electromagnets below.
12. Determine the direction of the current through the coil of wire if the electromagnet and
the permanent magnet are repelling and draw the field line for the two magnets.
Yaw D. A -Saint Laurent Adult Centre-2012-13
PSC-4011-2—w/ Yaw--------------------------------------------------------------quiz -------------------------------------------------------------------------Electricity (2-5)
13. Using Coulombs law (k = 9 X10 9 Nm2/C2)
a. Determine the electric force between Q1= - 2 C and Q2 = 3 C separated by 50 cm.
b. What happens to the force if both charges are doubled? Justify your answer.
c. What happens to the force if the distance is doubled? Justify your answer.
d. What happens to the force if the distance is decreased by half? Justify your
answer.
Yaw D. A -Saint Laurent Adult Centre-2012-13
PSC-4011-2—w/ Yaw--------------------------------------------------------------quiz -------------------------------------------------------------------------Electricity (2-5)
14. For each pair, determine which event occurred first.
a. First pair:
i. Gilbert discovers that a number of substances can be electrified.
ii. Compass appears in Europe.
b. Second pair:
i. Magnetite and Iron have been discovered to attract each other.
ii. Volta invents the first cell.
c. Third pair:
i. Marconi invents the radio
ii. Oersted proves that electricity and magnetism are related
d. Fourth pair:
i. Musschenbroek discovers the leyden jar
ii. Faraday discovers electromagnetic induction
Yaw D. A -Saint Laurent Adult Centre-2012-13