19 practical electricity

Question 1

Formula

Electrical Energy

Answer 1

E
= QV
= VIt
= I²Rt
= (V²/R)t

Q = charge
V = voltage
I = current
R = resistance
Unit: Joule, J

Question 2

Formula

Power

Answer 2

P
= E/t
= IV
= I²R
= V²2/R

V = voltage
I = current
R = resistance
E = energy
Unit: Watt, W

Question 3

Formula

Electricity Consumption

Answer 3

EC = Pt

Unit:
Wh, Watt-hour
Kilowatt-Hour, kWh = 3.6 x 10⁶ J

Question 4

Dangers

Electricity

Answer 4

• Damaged Wire Insulation
• Overheating of Cables
• Damp Conditions

Question 5

Safety Measures

Electricity

Answer 5

• Lightning Circuits
• Power Circuits
  
  • Live Wire
  • Neutral Wire
  • Earth Wire
• Double Insulation
• Three-Pin Plug
• Switches
• Circuit Breakers