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Practical Electricity (Ri Tong) - Coggle Diagram
Practical Electricity (Ri Tong)
Power
What is power?
It is the rate of converting electrical energy into other forms of energy
SI unit
Watt (W)
Joule per second (J/S)
The larger the power an electrical appliance is, the larger the amount of electrical energy it consumes
Cost of Electrical Consumption
What device is used to measure the amount of electrical energy consumed?
Electricity meter
What is the unit of electrical energy measured by electricity meters?
Kilowatt-hour (kWh)
Why is kilowatt-hour used as the unit for measuring electrical energy in households and industries instead of the unit joule?
The amount of electrical energy consumed by households and industries are very large.
The unit joule is a very small unit, so it is not suitable to measure the electrical energy consumption in households and industries.
What is meant by 1 kWh?
The electrical energy consumed by an electrical appliance of 1 kW in one hour
2 important steps to calculate the cost of energy used in households and offices
To find the amount of electrical energy consumed
Power (kW) × Time (h)
To calculate the cost of electrical energy consumed
Units of electrical energy consumed (kWh) × Cost per unit
Wiring in 3-Pin Plugs
What is it used for?
It is generally used to connect an electrical appliance to power circuits
3 types of wiring in and 3-pin plugs
Live Wire
Marking
L
Colour
Brown
Current during normal functioning
Present
Potential difference during normal functioning
High
Neutral Wire
Marking
N
Colour
Blue
Current during normal functioning
Present
Potential difference during normal functioning
Low
Earth Wire
Marking
E
Colour
Green and Yellow
Current during normal functioning
Absent
Potential difference during normal functioning
Low
Components
Earth wire
Neutral wire
Live wire
Fuse
Cord grip
Cable sleeve
Using electricity