WorksheetsElectricity and magnetism review
Total questions: 20
Worksheet time: 10mins
Name
Class
Date
1.
Which of the following is true about the difference between a series circuit and a parallel circuit?
a)
a series is composed of multiple paths while a parallel circuit only has one
b)
only a series circuit can supply power
c)
all parallel circuits require a switch
d)
in a series circuit, when one bulb breaks all the bulbs break
2.
Which of the following will increase the current in a circuit?
a)
Changing the battery from a 9V to a 12V
b)
increasing the length of the wire
c)
making the wire more narrow
d)
using aluminum wire instead of copper wire
3.
An electric current requires all of the following except:
a)
Resistor
b)
power source
c)
conductor
d)
switch
4.
The diagram below shows a simple circuit. Which of the following is true:
a)
If we cut the wire, the current will still flow and light the bulbs
b)
if the first bulb goes out the other two will remain lit
c)
an example of this type if circuit would be christmas lights
5.
Anna wants to be able to pick up a spoon with her electromagnet. Which of the following would increase the strength of the magnetic field.
a)
use a lower voltage battery
b)
reverse the polarity
c)
use an insulator instead of a nail
d)
increase the number of coils around the nail
6.
Any material that allows the flow of electrons (electricity) to move through it easily is known as...
a)
insulator
b)
circuit
c)
generator
d)
conductor
7.
Savannah has a compass that is refusing to point north. What could be nearby causing her compass to malfunction?
a)
heat energy
b)
a strong electric current
c)
gravitational force
d)
light energy
8.
When resistance increases current will....
a)
decrease
b)
remain the same
c)
match the resistance
d)
increase
9.
All of the following INCREASES resistance EXCEPT:
a)
lengthening the wire
b)
increase the wire thickness
c)
using a poor conductor
d)
decreasing current
10.
Like charges _________ while opposite charges_____________.
a)
attract; repel
b)
repel; repel
c)
attract; attract
d)
repel; attract
11.
The flow of electrons in an area of high potential to an area of low potential is known as _____________. The SI Unit for this is Amperes.
a)
voltage
b)
charge
c)
current
d)
resistance
12.
Two batteries wired in _____________ will have the same battery life but twice the voltage causing the bulbs to get brighter.
a)
series
b)
parallel
c)
opposite
d)
direct
13.
A clothes dryer requires 50 Amps and uses larger power wires with a max resistance of 7.5 ohms. What is the voltage required to run the dryer safely?
a)
375 volts
b)
6.8 volts
c)
0.14 volts
d)
215 volts
14.
The outlets in your home put out a voltage of 170V. If the current through your vacuum cord is 0.7A, then what is the resistance?
a)
50 Ohms
b)
243 Ohms
c)
119 Ohms
d)
78 Ohms
e)
Option 2
15.
The graph below shows the relationship between current and voltage. The resistance remains the same.
Pick the point: current .6 and resistance .6 of the graph. What is the resistance?
a)
.6
b)
1
c)
1.1
d)
.8
16.
What happens to the current (I) if you increase voltage?
a)
the amount of current increases
b)
the amount of current decreases
17.
What happens to the resistance (R) if you decrease the voltage?
a)
the resistance increases
b)
the resistance decreases
18.
A circuit has a resistance of 4.0 ohms and a current of 7.0 Amps. What is the voltage?
a)
.57 volts
b)
1.75 volts
c)
21 volts
d)
28 volts
19.
an electric hair dryer has one of the ONLY plugs that receive 100 volts. In order to heat up, the heating element has a resistance of 10.5 ohms. How much current flows through the circuit in the hair dryer?
a)
1050 amps
b)
9.5 amps
c)
0.105 amps
d)
105 amps
20.
The current in a circuit is 0.9 amps and the voltage is 22 volts. What is the resistance?
a)
19.8 ohms
b)
24.4 ohms
c)
0.0409 ohms
d)
1.98 ohms
100 %
