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Primary winding of a transformer is determined by _________.
which winding has more turns
which winding is nearer to the load
which winding is connected to the source
which side has the highest voltage
What type of transformer is used to increase the voltage from power stations?
Why transformers work with A.C. current but not D.C.
A.C current produces changing magnetic field.
D.C current produces changing magnetic field.
D.C current is weak
A.C current is powerful
Which of the following does not change in a transformer?
This picture is an example of a ________________.
Ratio of voltages is equal to ratio of _______________________.
number of iron sheets in core
number of turns in coil
number of electromagnetic
A transformer has 100 turns in the primary coil and 25 turns in the secondary coil. When a 120 V is applied to the primary coil, what is the voltage in the secondary coil?
The function of a transformer is to ...
raise and lower the apparent power levels
transfer DC voltage from the primary winding to the secondary winding
increase or decrease A.C voltage or A.C current levels
transform mechanical energy into electrical energy
A step up transformer has its primary winding to secondary winding ratio
Greater than 1
Equal to 1
Less than 1
The electrical energy is transferred through the ... in a transformer.
A step up transformer _____________.
Transformers are able to transform both AC and DC Voltages in a Circuit
The input voltage to a transformer is usually ____ voltage.
both AC & DC
Moving a permanent magnet through a coil of wire will
demagnetize the magnet
the wire will become an electromagnet
the magnet will become electrified
a current will be generated in the wire
What type of current is produced in a battery