Define electrostatic potential at a point.
Define electrostatic potential at a point.
Electric potential at a point is defined as the amount of work done in moving a unit charge from infinity to that point.
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Define current. Give its $SI$ unit.
Define current. Give its $SI$ unit.
Out of the following bulbs rated $40\, W , 220\, V$ $60\, W , 220 \,V$ and $100\, W , 220\, V$ which one will glow the brightest when connected in series to a supply of $220\, V$ $?$
Out of the following bulbs rated $40\, W , 220\, V$ $60\, W , 220 \,V$ and $100\, W , 220\, V$ which one will glow the brightest when connected in series to a supply of $220\, V$ $?$
$Ohm's$ law is a relation between the power used in a circuit to the current and the potential difference.
$Ohm's$ law is a relation between the power used in a circuit to the current and the potential difference.
Draw a circuit diagram of an electric circuit containing a cell, a key, an ammeter, a resistor of $2\,\Omega $ in series with a combination of two resistors ($4\,\Omega $ each) in parallel and a voltmeter across the parallel combination. Will the potential difference across the $2\,\Omega $ resistor be the same as that across the parallel combination of $4\,\Omega $ resistors? Give reason.
Draw a circuit diagram of an electric circuit containing a cell, a key, an ammeter, a resistor of $2\,\Omega $ in series with a combination of two resistors ($4\,\Omega $ each) in parallel and a voltmeter across the parallel combination. Will the potential difference across the $2\,\Omega $ resistor be the same as that across the parallel combination of $4\,\Omega $ resistors? Give reason.
$1\;kWh =\ldots\ldots$ $joule$
$1\;kWh =\ldots\ldots$ $joule$