Question

how much current will an electric bulb draw from 220V source if the resistance of the bulb is 1200 ohms?

Answer 1

Answer:

220v rs 1200 it current this your answer

Answer 2

Answer:

. Current drawn by the bulb = 0.183 Amperes.

. Curent drawn by the heater = 2.20 Amperes.

Explanation:

According to Ohm's law, the current I flowing through an electrical element is directly proportional to the potential difference V applied across it.

\begin{gathered}\rm I \propto V\\I=\kappa V\\V=\dfrac{1}{\kappa}\ I\\V=RI.\\\\where, \ R = \dfrac{1}{\kappa}.\end{gathered}

I∝V

I=κV

V=

κ

1

I

V=RI.

where, R=

κ

1

.

R is called resistance of the element.

For the electric bulb:

V = 220 V.

R = 1200 \text{\O}mega.Ømega.

Using Ohm's law,

\rm I = \dfrac VR = \dfrac{220}{1200}=0.183\ A.I=

R

V

=

1200

220

=0.183 A.

For the heater:

R = 100 \text{\O}mega.Ømega.

V = 220 V.

Using Ohm's law,

\rm I = \dfrac VR = \dfrac{220}{100}=2.20\ A.I=

R

V

=

100

220

=2.20 A.