A 50 ohm resistor has an emf of 100 V applied across it. (a) How must current flows through the resistor and the power dissipated? (b) if the resistance is double, calculate the new emf to maintain the same current as in (a). (c) To what value must the resistance be increased if a current of 50 mA must flow when the emf is 60 V?
Ohm's law
Ohm’s law is a prominent concept in physics and electronics. It gives the relation between the current and the voltage. It is used to analyze and construct electrical circuits. Ohm's law states that the voltage across a conductor is directly proportional to the current flowing through it.
Path of Least Resistance
In a series of alternate pathways, the direction of least resistance is the actual or metaphorical route that offers the least resistance to forwarding motion by a given individual or body.
A 50 ohm resistor has an emf of 100 V applied across it. (a) How must current flows through the resistor and the power dissipated? (b) if the resistance is double, calculate the new emf to maintain the same current as in (a). (c) To what value must the resistance be increased if a current of 50 mA must flow when the emf is 60 V? ( d) Calculate the cost of energy in (c) if it operates 5 hrs a day for 30 days and it cost 10.37 pesos per KW-hr.
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