TRANSMISSION AND DISTRIBUTION OF ELECTRICITY

Why is alternating current used instead of direct current in the transmission of electricity through long distances?

• Only alternating current can flow through the cables.

• Alternating current voltage can be stepped up or stepped down by using transformers.

• Most of the electrical appliances work only with alternating current.

• Generating direct current is more complicated than generating alternating current.

The function of the transformer in the transmission of electricity is to

• increase the resistance.

• change the voltage.

• reduce the time to transmit the electricity.

• increase the power.

The efficiency of transmitting electrical power by cable through great distance can be improved by

• lowering the voltage and using thick cable.

• lowering the voltage and using big current.

• increasing the voltage and using thin cable.

• increasing the voltage and using thick cable.

The power loss can be reduced by:

• Reducing the resistance of the cables

• Reducing the current in the cable

• Reducing the voltage in the cable

• Increasing the voltage in the cable

Tags

NGSS.HS-PS3-5

Function of transformers on distribution poles is to .............. voltage for use in homes.

• step down

• step up

• step right

• step left

Tags

NGSS.MS-ETS1-1

What's this?

• It's an electric meter.

• It's a fuse box.

• It's a circuit breaker

List of parts of Power system.

• Generation, transmission and distribution.

• generation, transmission and transformer

• generation, impedance and distribution.

• Motor, transmission and distribution.

Electricity is distributed along…

• Direct current

• Alternating current

• Transmission lines

• Transformer

If the current is transmitted at high voltage...

• less energy is lost

• more energy is lost

• it produces alternating current

• underground cables are used

Heavy industry usually needs a voltage of...

• 33,000 volts

• 11,000 volts

• 120 volts

• 140 volts