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If the charge on an electron is $1.6 \times 10$ coulombs, how many electrons should pass through a conductor in $1$ second to constitute $1$ ampere current?
Derive the expression for the heat produced due to a current ‘I’ flowing for a time interval ‘t’ through a resistor ‘R’ having a potential difference ‘V’ across its ends. With which name is this relation known?
An electric bulb is rated as 10W, 220V. How many of these bulbs can be connected in parallel across the two wires of 220V supply line if the maximum current which can be drawn is 5A?
A resistor has a resistance of 176 ohms. How many of these resistors should be connected in parallel so that their combination draws a current of 5 amperes from a 220 volt supply line?
A resistance of $40$ ohms and one of $60$ ohms are arranged in series across $220$ volt supply. Find the heat in joules produced by this combination of resistances in half a minute.