write the relation between electric resistance and electric current and explain variable resistance and rheostat
Answers
Answer:
Resistance is a property of conductor due to which it resists the flow of electric current through it. Component that is used to resist the flow of electric current in a circuit is called resistor. ... Rheostat: This is a device which is used in a circuit to provide variable resistance.
Answer:
Resistance is a property of conductor due to which it resists the flow of electric current through it. Component that is used to resist the flow of electric current in a circuit is called resistor. ... Rheostat: This is a device which is used in a circuit to provide variable resistance.
Explanation:
1.The relationship between current, voltage and resistance is expressed by Ohm's Law. This states that the current flowing in a circuit is directly proportional to the applied voltage and inversely proportional to the resistance of the circuit, provided the temperature remains constant.
2.Rheostat, adjustable resistor used in applications that require the adjustment of current or the varying of resistance in an electric circuit. ... The rheostat can adjust generator characteristics, dim lights, and start or control the speed of motors.