Question

400J of heat is produced in 4 sec. in a 4 ohms resistor. Find potential difference across the resistor.

Answer 1

Answer:

400 volts

Explanation:

given ,

heat=q=400J and time-t=4sec

we know that current=heat/time=q/t

                                                    = 400/4

                                                    =100 amperes

given, resistance=r=4ohm

we know that potential difference=v=current ×resistance from ohm's law

                                                        =v=ir

                                                          v=100×4

                                                          v=400 volts

∴the potential difference is 400 volts

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Answer 2

20 volts .. check the attachment