Electrical Supply

Electrical power can be calculated using

• Resistance x Voltage

• Voltage x Current 

• Voltage ÷ Current

What is the unit of Electrical Power?

• Joule

• Watt

• Where

• Amp

Match the picture to their function.

• Supply electrical energy

• Produce light

Label the electrical component.

• Dry cell

• Bulb

• Switch

• Connecting wires

Label the elctrical component.

• Connecting wires

• Dry cell

• Bulb

• Switch

Label the elctrical component.

• Connecting wires

• Switch

• Bulb

• Dry cell

Label the electrical component.

• Switch

• Connecting wires

• Bulb

• Dry cell

The flowchart shows the sequence of the components in the electricity transmission and distribution system.

Power station -----> _____________ -----> National Grid Network ----> Main substation ----> _____________ ----> _____________ ----> Branch substation ----> Step-down transformer

• Switch zone, step-up transformer, step-down transformer

• Switch zone, step-down transformer, step-up transformer

• Step-up transformer, step-down transformer, switch zone

• Step-up transformer, switch zone, step-down transformer

The voltage of alternating current, a.c., is ___________ before it is transmitted through the National Grid Network.

• increased

• decreased

The voltage of the alternating current is highest at the

• power station

• National Grid Network

• branch substation