uses and effects of electricity worksheet
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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? ____________________________________________________________________
2
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____________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________
3
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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