Practical Electricity Flashcards
What is power
The amount of energy per second
What are the main formula for power
P=E/T
P=VI
What are the other formulas for power
P=I²*R
What is the main formula for energy
E=VIT
Other formulas for energy
E= (V²/R)T
E=I²R*T
What is a kilowatt hour
How many kilowatts are used per second
What are the steps to calculate the cost of electricity
Step 1: Convert power to KW
Step 2:Convert time to hours
Step 3:Find energy
Step 4:Cost=KwH*rate
What is electrical energy
The energy supplied by a cell or battery
What is a live wire
Carries current to appliance at high voltage
What is a neutral wire
The wire through which current leaves the appliance with negligible voltage
What is an earth wire
The wire used for protection and is connected to the metal case
What are the dangers of electricity
Damaged insulation
Overheating cables
Using electricity in wet conditions
What are some safety precautions when handing electricity
Double insulation
Earthing
Selection of food fuse rating
What is a fuse
A safety device used in circuits to protect the appliance from excess current
What is a circuit breaker
An electrical switch designed to protect a circuit from excessive current
