Answer:
(a) %a, 10 A, 0.833 A
(b) 12 ohm
(c) $22.8
Explanation:
Power of toaster, P1 = 600 W
Power of iron, P2 = 1200 W
Power of bulb, P3 = 100 W
V = 120 V
As they are in household circuit, so they are connected in parallel, so the voltage is same for all.
(a) Use the formula P = V x i
Current in toaster, i1 = P1 / V = 600 / 120 = 5 A
Current in iron, i2 = P2 / V = 1200 / 120 = 10 A
Current in bulb, i3 = P3 / V = 100 / 120 = 0.833 A
(b) Resistance of heating element of iron is R2.
V = i2 x R2
120 = 10 x R2
R2 = 12 ohm
(c) Total energy consumed in 24 hours for 5 days
= (600 + 1200 + 100) x 24 x 5 = 228000 Wh = 228 KWh
Cost of 1 KWh = $0.1
Cost of 228 KWh = 0.1 x 228 = $22.8
