Transformers

The function of the transformer in the transmission of

electricity is to......................... (choose ALL that apply)

• change the voltage magnitude

• increase the power

• increase the resistance

• reduce the time to transmit the electricity

• transfer power from one point to another

Tags

NGSS.HS-PS3-3

If a transformer reduces voltage, it is called a/an ....................... transformer.

• step left

• step right

• step up

• step down

• decrease

If a transformer increases voltage, it is called a/an ......... transformer.

• step right

• step left

• step up

• step down

• increase

Step-up transformers...

• increase the voltage

• decrease the voltage

• increase current

• decrease current

Which number of turns of primary and secondary of transformer is suitable in order to stepped up the voltage from 25 kV to 132 kV ?

• primary: 1000 turns

  secondary: 52,800 turns

• primary : 55,000 turns

  secondary : 1000 turns

• primary: 2,500 turns

  secondary: 13,200 turns

• primary : 13,200 turns

  secondary : 20,500 turns

Tags

NGSS.HS-PS3-3

Which number of turns of primary and secondary of transformer is suitable in order to stepped down the voltage from 11 kV to 240 V ?

• Primary : 11,0000 turns

  Secondary: 240 turns

• Primary : 240 turns

  Secondary: 11,000 turns

• Primary : 1100 turns

  Secondary: 240 turns

• Primary : 240 turns

  Secondary : 24 turns

Which number of turns of primary and secondary of transformer is suitable in order to stepped down the voltage from 132 kV to 33 kV ?

• Primary : 13,200 turns

  Secondary: 3,300 turns

• Primary : 3,300 turns

  Secondary: 13,200 turns

• Primary : 13,200 turns

  Secondary: 1300 turns

• Primary : 1300 turns

  Secondary : 13,200 turns

The windings of a transformer which is connected to a source of energy is called the ....... winding.

• primary

• secondary

• input

• output

Ahmad charged his hand phone using battery charger.
The charger has a transformer as in the diagram.
What is the number of turns of the secondary coil?

The following formula may be useful;
 $\frac{V_P}{V_S}=\frac{N_P}{N_S}=\frac{I_S}{I_P}$  

• 2 160

• 1 333

• 450

• 27

Tags

NGSS.HS-PS3-1

A transformer has 500 turns on its primary coil, and 100
turns on its secondary coil. An a.c voltage of 25 V is
connected across the primary coil.
What is the voltage across the secondary coil?

The following formula may be useful;
 $\frac{V_P}{V_S}=\frac{N_P}{N_S}=\frac{I_S}{I_P}$  

• 5.0 V

• 12.5 V

• 50.0 V

• 175.0 V

Tags

NGSS.HS-PS3-5