find the resistance of a charge of 3 coulombs on which work is done of 15 joules for the time of 30 seconds
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Ok, let's recall OHM'S LAW.
Ohm's law states that all physical conditions remaining constant, the potential difference between two points in an elecric field is directly proportional to the amount of current flowing through it. And resistance offered is the CONSTANT for Ohm's Law.
As per Ohm's law, Potential difference is equal to the product of current flowing and resistance offered.
However, potential difference is equal to work done/charge, that is work done upon unit charge.
So, Potential difference in this case = (15/3) Volts = 5 Volts
Also, Electric current = (3/30) Ampere = 0.1 Ampere
Thus, Resistance = (5/0.1) ohm = 50 ohm
For knowledge, you should remember that OHM is the unit of resistance. However, reciprocal of resistance is termed as CONDUCTANCE and its unit is called MHO (that is, ohm to the power minus 1).
Ohm's law states that all physical conditions remaining constant, the potential difference between two points in an elecric field is directly proportional to the amount of current flowing through it. And resistance offered is the CONSTANT for Ohm's Law.
As per Ohm's law, Potential difference is equal to the product of current flowing and resistance offered.
However, potential difference is equal to work done/charge, that is work done upon unit charge.
So, Potential difference in this case = (15/3) Volts = 5 Volts
Also, Electric current = (3/30) Ampere = 0.1 Ampere
Thus, Resistance = (5/0.1) ohm = 50 ohm
For knowledge, you should remember that OHM is the unit of resistance. However, reciprocal of resistance is termed as CONDUCTANCE and its unit is called MHO (that is, ohm to the power minus 1).
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