WorksheetsElectricity Unit Review
Total questions: 36
Worksheet time: 18mins
Name
Class
Date
1.
Which of the following items found in most homes could be used to make an electrochemical cell?
a)
A bread bag, water, and a lemon
b)
An iron nail, a copper penny and a lemon
c)
A ceramic plate, cooking oil, and an aluminum fork
d)
A stainless steel spoon, milk, and a stainless steel fork
2.
Which of the following options correctly describes the above circuit diagram?
a)
Two lamps are receiving electricity from a power source. Each lamp is separately controlled by a switch. The electrons go through the switch before the lamps.
b)
Two lamps are receiving electricity from a power source. Each lamp is separately controlled by a switch. The electrons go through the lamps before the switch.
c)
Two lamps are receiving electricity from a power source. Both lamps are controlled by the same switch. The electrons go through the switch before the lamps.
d)
Two lamps are receiving electricity from a power source. Both lamps are controlled by the same switch. The electrons go through the lamps before the switch.
3.
The most common type of energy loss in electrical devices is ...
a)
thermal
b)
potential
c)
chemical
d)
mechanical
4.
How will two acetate strips charged in the same way react to each other?
a)
They will attract one another.
b)
They will repel one another.
c)
They will not affect one another.
d)
They will neutralize one another.
5.
When an uncharged object loses electrons, it becomes...
a)
fully charged.
b)
negatively charged.
c)
neutral.
d)
positively charged.
6.
Which of the following are among the laws of static electricity? I. Similar charges attract. II. Similar charges repel. III. Opposite charges attract. IV. Opposite charges repel. V. Neutral objects are attracted to charged objects.
a)
I, IV, and V
b)
I, II, and V
c)
II, IV, and V
d)
II, III, and V
7.
Materials that do not allow a charge to move freely on or through them are called...
a)
conductors.
b)
unbalanced.
c)
balanced.
d)
insulators.
8.
If a material is to be classified as a good electrical conductor, it must...
a)
hold its electrons tightly.
b)
have no electrons
c)
hold its electrons loosely
d)
have electrons that are neutral
9.
What is the best way to measure the current through the circuit illustrated above?
a)
Detach the circuit and attach a voltmeter into the circuit.
b)
Place the test probes of a voltmeter on either side of the lamp.
c)
Detach the circuit and attach an ammeter into the circuit.
d)
Place the test probes of an ammeter on either side of the lamp.
10.
Ross uses a voltmeter to measure the potential difference across different points in the circuit illustrated. Across which two points will the potential difference be the lowest?
a)
Between the positive and negative terminals of the battery.
b)
Across the lamp.
c)
Across the two sides of the switch.
d)
Between the lamp and positive end of the battery.
11.
Potential difference is more commonly referred to as...
a)
current
b)
voltage
c)
resistance
d)
power
12.
The part of a complete circuit that converts electricity into other forms of energy is known as the ...
a)
control
b)
conductor
c)
load
d)
source
13.
Which of the following incorrectly describes the above circuit?
a)
One of the switches controls all of the lamps.
b)
This circuit is parallel.
c)
Removing the lamp closest to the negative terminal of the battery will dim the other lamps.
d)
One of the switches controls only one lamp.
14.
Which of the following is not a requirement for an electric circuit?
a)
A continuous pathway
b)
A grounder
c)
A conductor
d)
A source
15.
The voltage of most household appliances is
a)
240 V
b)
120 V
c)
9 V
d)
6 V
16.
A parallel circuit has three 15 ohm resistors. What is the total resistance of the circuit?
a)
0.2 ohm
b)
5 ohm
c)
15 ohm
d)
45 ohm
17.
Which of the following conditions would offer the lowest amount of resistance?
a)
Short copper wire at high temperature
b)
Short copper wire at a low temperature
c)
Long copper wire at a high temperature
d)
Long copper wire at a low temperature
18.
In a circuit diagram, the battery has a current of 9 A and the lamp has a resistance of 6 ohm. Given that R = V/I, what is the voltage through the circuit?
a)
0.67 V
b)
1.5 V
c)
15 V
d)
54 V
19.
If you can turn on your radio and hear music, but you cannot control the volume, the source of the problem is probably...
a)
the connection between the power cord and the wall circuit
b)
the electromagnets in the circuits of the radio
c)
the electrodes in the cell of the radio
d)
the variable resistors in the radio
20.
When the alarm in your wristwatch chimes, this is an example of the ...
a)
piezoelectric effect
b)
photoelectric effect
c)
thermopile effect
d)
electrochemical effect
21.
Which one of the following devices is most likely to rely on a photovoltaic cell?
a)
a motor
b)
a calculator
c)
a toaster
d)
a microwave
22.
Which of the graphs best represents the relationship between voltage and current?
a)
a
b)
b
c)
c
d)
d
23.
Joe watches television for 6.00 hrs (21 600 seconds). The input power rating of his television is 200 W. The electrical energy consumed by any electrical device can be calculated using E = P x t. The electrical energy consumed by Joe's television is...
a)
33.3 J
b)
108 J
c)
1200 J
d)
4 320 000J
24.
Which of the following modifications to an electromagnet will increase its strength?
a)
Using a larger iron core
b)
Using more coils of copper wire
c)
Increasing the resistance of the iron core
d)
Decreasing the current passing through the coils of copper wire
25.
Which of the following cells would produce the highest voltage?
a)
Two electrodes of copper metal in a solution of sugar water
b)
Two electrodes of zinc metal in a solution of sulfuric acid
c)
Electrodes of copper and zinc in a solution of sugar water
d)
Electrodes of copper and zinc in a solution of sulfuric acid
26.
What should the recording on the ammeter be if the voltage is 9V and the resistance of the load is 3 ohms. The formula is R = V/I
a)
0.33 A
b)
3 A
c)
12 A
d)
27 A
27.
You show a camp maintenance supervisor how a compass can be used to detect electric current in a copper wire. You explain that current flowing in a wire deflects the compass needle because...
a)
the compass needle is electric
b)
the wire is magnetic
c)
electrons move freely within the wire
d)
a magnetic field is formed around the wire
28.
Within the generator, electricity is produced as a result of...
a)
a coil of wire spinning around an insulator
b)
a coil of wire spinning within a magnetic field
c)
an insulator spinning around a coil of wire
d)
magnets spinning within an electric field
29.
If a fluorescent light bulb uses 120 J of electrical energy and emits 23.4 J of energy in the form of light, then the efficiency of the light bulb is...
a)
5.1 %
b)
16.3 %
c)
19.5 %
d)
24.2 %
30.
A ride in an amusement park is controlled by an operator who turns a dial to make the seats rotate faster. As the operator turns the dial, more current flows to the motors. Which of the following electrical devices causes the seats on the ride to rotate faster?
a)
variable resistor
b)
circuit breaker
c)
generator
d)
ammeter
31.
Which of the following circuits would result in the dimmest light?
a)
1 battery, 3 light bulbs wired in series
b)
1 batter, 5 light bulbs wired in series
c)
1 battery, 3 light bulbs wired in parallel
d)
1 battery, 5 light bulbs wired in parallel
32.
Which of the following parts of a lead-acid car battery is acidic?
a)
electrode
b)
electrolyte
c)
positive terminal
d)
negative terminal
33.
When clothes are removed from the clothes dryer, sparks can be seen as the clothes are separated. These sparks are a result of...
a)
current electricity
b)
an electrical discharge
c)
a buildup of neutral atoms
d)
anti-static sheets absorbing neutral charges
34.
While you were cooking with a hot plate and toasting a slice of bread, the electric heaters started. Almost immediately, the hot plate, toaster, and electric heaters quit working. This most likely happened because...
a)
a fuse in the toaster burned out
b)
a circuit breaker in the electrical panel tripped
c)
the element in the hot plate burned out
d)
the circuit breakers in the electric heaters tripped
35.
The bare wire in household wires is the...
a)
wire that carries the current from the outlet to the device
b)
wire that carries the current from the device to the outlet
c)
the wire that acts as a grounder for safety
d)
wire that is optional
36.
A generator that contains a split ring commutator must...
a)
produce AC current from mechanical energy
b)
produce DC current from mechanical energy
c)
produce mechanical energy from AC current
d)
produce mechanical energy from DC current
100 %
