Question

how much current will an electric bulb draw from 220v source. if the resistance of the bulb is 1200 ohm. in place of bulb a heater of resistance 100 ohm is connected to source. calculate the current drawn by it.

Answer 1

HEY!!

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▶️According to ohm's law: V = I R

▶️Where  V is voltage applied, in volts(V) 

▶️I is current drawn, in ampere(A) 

▶️R is the resistance of the circuit, ohms(Ω)

⚫For bulb,

⏺️V = 220V

⏺️R = 1200Ohm

⏺️so I = V/R

⏺️⏺️= 220/1200 = 0.183 Ampere

⚫For heater,

⏺️V = 220 V

⏺️R = 100 Ohm

⏺️so I = V/R 

⏺️⏺️220/100 = 2.2 Ampere

Answer 2

For the electric bulb:

V = 220 V.

R = 1200 Ω.

Using Ohm's law,

V=IR

220 = I × 1200

220/1200 =I

I =0.183 A

For the heater:

R = 100 Ω.

V = 220 V.

Using Ohm's law,

V= IR

220= I×100

220/100= I

I =2.2A