State Ohm's law Express it mathematically. (b) Write symbols used in electric circuits to represent: (i) variable resistance (ii) Voltmeter. ( c) An electric bulb is rated 220V and 100W. When it is operated on 110V,what will be the power consumed?

State Ohm's law Express it mathematically. (b) Write symbols used in

1.	State Ohm's law Express it mathematically. (b) Write symbols used in electric circuits to represent: (i) variable resistance (ii) Voltmeter. ( c) An electric bulb is rated 220V and 100W. When it is operated on 110V,what will be the power consumed?
Answer» SOLUTION :According to Ohm.s law physical condition like temperature remaining constant, the current passing through a conductor is directly proportional to the POTENTIAL difference maintained across the ends of the conductor i.e., `V prop I or V=IR` Here R is known as the resistance of given conductor. It is a PROPERTY of the conductor which affects the FLOW of current. For a given conductor value of resistance R is a constant R is a constant at a given temperature (b) Symbols for given electrical components are given below: (i) VARIABLE resistance (ii) Voltmeter