Question

Four lamps of 200w, 60w,100w and 40w respectively are connected to a main supply of 220v. Calculate the total current consumed.

Answer 1

We know 

P = Vi

I = \(\frac{P}{V}\)

I₁ = \(\frac{200}{220}\)

I₁ = 0.90 A

I = \(\frac{P}{V}\)

I₂ = \(\frac{60}{220}\)

I₂ = 0.27 A

I = \(\frac{P}{V}\)

I₃ = \(\frac{100}{220}\)

I₃ = 0.45 A

 I = \(\frac{P}{V}\)

I₄ = \(\frac{40}{220}\)

I₄ = 0.181 A

Then total current I = I₁ + I₂ + I₃ + I₄

I = 0.90 + 0.27 + 0.45 + 0.181

I = 1.8 ampere