WorksheetsEM Induction
Total questions: 13
Worksheet time: 8mins
Name
Class
Date
1.
When there is a change in the magnetic field in a closed loop of wire
a)
(a) a voltage is induced in the wire
b)
(b) current is made to flow in the loop of wire
c)
(c) electromagnetic induction occurs
d)
(d) all of these
2.
Thrust a magnet into a coil of wire. While the magnet is being moved toward the coil
a)
(a) becomes an electromagnet
b)
(b) has a current in it
c)
(c) both of these
d)
(d) neither of these
3.
If a magnet is pushed into a coil, voltage is induced across the coil. If the same magnet is pushed
into a coil with twice the number of loops,
into a coil with twice the number of loops,
a)
a. one-half as much voltage is induced.
b)
b. the same voltage is induced.
c)
c. twice as much voltage is induced.
d)
d. four times as much voltage is induced.
4.
A generator is used to light a bulb. Energy for lighting the bulb actually comes from a
a)
coil or wire
b)
mechanical intput to the generator
c)
magnet in the generator
d)
plug where the generator is connected to the wall
5.
A device that converts mechanical energy into electrical energy
a)
A. electric generator
b)
B. electric motor
c)
C. electromagnetic induction
d)
D. mechanical generator
6.
The process of creating a current in a circuit by changing a magnetic field
a)
A. electric generator
b)
B. electric motor
c)
C. electromagnetic induction
d)
D. magnet
7.
What is created when a magnet moves through a coil of wire?
a)
A. an
electromagnet
b)
B. a ferromagnet
c)
C. a
solenoid
d)
D. an
electric current
8.
Who discovered electromagnetic induction?
a)
Hans Christian Orsted
b)
Michael Faraday
c)
James Maxwell
d)
Heinrich Hertz
9.
A magnet is moved in and out of a coil of wire connected to a high-resistance voltmeter. If the number of coils doubles, the induced voltage
a)
quadruples
b)
doubles
c)
is the same
d)
halves
10.
A device consisting of a coil that is mechanically rotated in a stationary magnetic field is called
a)
a transformer
b)
a motor
c)
a generator
d)
a dipole
11.
A bike-dynamo is rotated by hand, with its terminals attached to the inputs of a CRO. If it is rotated twice as fast,
a)
the amplitude and frequency of the voltage will both double
b)
the amplitude will double and the frequency will be unchanged
c)
the amplitude will be unchanged and the frequency will double
d)
the amplitude will increase by four times and the frequency will double
12.
"Double insulated" devices do not need . . .
a)
An earth wire
b)
A neutral wire
c)
A fuse
d)
An asbestos mat
13.
The correct fuse to use with a device labelled "230V, 920W" is
a)
13A
b)
10A
c)
5A
d)
3A
100 %
