$(a)$ How much current will an electric bulb draw from a $220 \ V$ source,if the resistance of the bulb filament is $1200 \ \Omega$?
$(b)$ How much current will an electric heater coil draw from a $220 \ V$ source,if the resistance of the heater coil is $100 \ \Omega$?
$(b)$ How much current will an electric heater coil draw from a $220 \ V$ source,if the resistance of the heater coil is $100 \ \Omega$?
(N/A) Given: Potential difference $V = 220 \ V$,Resistance $R = 1200 \ \Omega$.
According to Ohm's law,$V = IR$,so $I = V / R$.
$I = 220 \ V / 1200 \ \Omega = 0.1833 \ A \approx 0.18 \ A$.
$(b)$ Given: Potential difference $V = 220 \ V$,Resistance $R = 100 \ \Omega$.
According to Ohm's law,$I = V / R$.
$I = 220 \ V / 100 \ \Omega = 2.2 \ A$.
According to Ohm's law,$V = IR$,so $I = V / R$.
$I = 220 \ V / 1200 \ \Omega = 0.1833 \ A \approx 0.18 \ A$.
$(b)$ Given: Potential difference $V = 220 \ V$,Resistance $R = 100 \ \Omega$.
According to Ohm's law,$I = V / R$.
$I = 220 \ V / 100 \ \Omega = 2.2 \ A$.
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