Uses and effects of electricity

Name__________________________Date___________________________

Direct current (d.c.)

Define the term Direct current (d.c.)____________________________________________________________________

Electrons flow from a _____________________ terminal in a battery to a ______________________________ terminal = _________________ current

Short way of writing direct current = _____________________________________

The electricity from a _________________________ will always be d.c.

Name three objects that work by using d.c. _____________________________________________________________________

However, the electricity we use in our homes is called __________________________ (a.c)

Alternating current (a.c.)

When you plug a lamp into a socket you are connecting the bulb to a _______________________________ (a.c.) supply

The _____________________in which the current flows changes very rapidly

In one second the direction changes _________________ times

4 things you should know about alternating current

Diagram =

1

Distinguish between a.c. and d.c.d.c. a.c.

The kilowatt-hour as the unit of electrical energy

Normal unit of energy = __________________________But the joule is a very_________________ amount of energy

Electrical supply companies use ___________________(kWh) as the unit of energy

Info about kWh1

2

Average price of a kWh =____________________________________________

Power rating of electrical appliances

Where can you find an appliances power rating? ______________________________

500 watt = _________________ kilowatts

60 watt = _______________kilowatts

Power rating of appliances

Appliance W kW

CalculationsNumber of units =___________________ X Total number of hours

Cost = _____________________________X cost per unit

What happens if a coil is placed in water and electricity passed through it? ____________________________________________________________________

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The three effects of electricity

Name the three types of energy that electrical energy is converted to in our homes

1_________________________2________________________3_________________________

Everyday uses of the heating effect of elecrticity

The electrical fuse

Two locations found

Purpose

Principle

If a fuse says 5A on it, what happens if the current flowing through the fuse exceeds 5A? _________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________

Experiment: To demonstrate the chemical effect of electricity

Materials____________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________

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Result__________________________________________________________________________________________________________________________________________________________________________________________________________

Conclusion_________________________________________________________________________________________________________________________________

To demonstrate the magnetic effect of electricity

Result__________________________________________________________________________________________________________________________________________________________________________________________________________

Conclusion __________________________________________________________________________________________________________________________________________

Everyday uses of the magnetic effect of electricity

The circuit breaker

Where in your home would you find a circuit breaker? _____________________________________________________________________

Function

4

Principle

What causes a circuit breaker to switch off? ____________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________

Fuse Versus circuit breakerFuse Circuit breaker

The plug

Live wire Colour of insulation = ____________________________Pin = _________________________________________

Neutral wireColour of insulation = ____________________________Pin = _________________________________________

Earth wireColour of insulation = ____________________________Pin = _________________________________________

The live and neutral pins. The live pin feeds power into an appliance while the neutral pin draws unused power back to the power source, creating a closed circuit for power to flow through. The ground pin acts as a safety device that is usually connected to the metal casing of an appliance. If the appliance malfunctions and the metal casing becomes electrified, the ground pin will direct the voltage into a safe ground so that the appliance user is not electrocuted.

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