Free Printable EMI &AC

Worksheets

EMI &AC

Total questions: 15

Worksheet time: 12mins

Name

Class

Date

How could the experimenter increase the amount of electricity being induced by this experiment?

Increase the number of coils

Decrease the number of coils

Flip the magnet around

Nothing, the amount of electricity cannot be increased

In 1831 who discovered electromagnetic induction?

Thomas Edison

Nikola Tesla

Michael Faraday

The unit of magnetic flux is the

Henry

Tesla

Faraday

Weber

Which pairs of materials could be used to create electromagnetic induction?

Coiled wire, a magnet

Coiled wire, a battery

A magnet, a battery

None of the above

Lenz’s law applies to

Electrostatics

lenses

electromagnetic induction

cinema

slides

The period of a wave is

the same as frequency

time required to complete one cycle

expressed in amperes

none of the above

A heater is rated as 230 V, 10 kW. The value 230 V refers to

average voltage

r.m.s voltage

peak voltage

In a pure inductive circuit

the current is in phase with voltage

the current lags behind the voltage by 90 degrees

the current leads the voltage by 90 degrees

the current can lead or lag voltage by 90 degrees

The r.m.s value of an alternating current is given by steady (D.C) current which when flowing through a given circuit for a given time produces

the more heat than produced by A.C when flowing through the sam circuit

the less heat than produced by A.C when flowing through the sam circuit

the same heat than produced by A.C when flowing through the same circuit

10.

In a pure inductive circuit, if the supply frequency is reduced to 1/2, the current will

be reduced by half

be doubled

be four times as high

be reduced to one fourth

11.

Capacitive reactance is more when

capacitance is less and frequency of supply is less

capacitance is less and frequency of supply is more

capacitance is more and frequency of supply is less

capacitance is more and frequency of supply is more

12.

Self-induced EMF is sometimes also known as

induced EMF

deduce EMF

back EMF

both a and b

13.

In the relation ϕ=BA cosθ, θ is angle

which normal to surface area makes with direction of magnetic field

which magnetic field makes with the surface

which is never constant

none of these

14.

The cause of induced e.m.f. is

magnetic flux

magnetic field

area

change in magnetic flux

15.

When number of turns of a solenoid is doubled, its self inductance will becomes

2 times

same

8 times

4 times

Reset

EMI &AC

Total questions: 15

Worksheet time: 12mins

Similar Resources on Wayground