A resistor is a circuit element that dissipates electrical energy usually as heat.
Real world devices that are modelled by resistors: incandescent light bulbs, heating
elements (stoves, heaters, etc.), long wires.
Resistance is measures in ohms.
Generation, storage and distribution of electrical energy
Rotating machinery such as generators, motors.
Propagation of electromagnetic energy
Very high frequency
Transmission of information electrically and optically
Modification of signals Power and energy:
Power= energy expanded/ time
= joule/sec= (watts)
Energy= power* time
1 watt per hour = 3600 joules
1 kilo watt hour= 3,600,000 joules
Work= force*distance (joules)
Power= work done per unit time
= work/time= joule/sec=watts
Power and energy- voltage and current
Establishing the rel