Q # 1 Current causes the temperature of a real resistor to increase why? What effect does this heating have on the resistance?

Q # 1Current causes the temperature of a real resistor to increase why? What effect does thisheating have on the resistance? ExplainQ # 2Many traffic lights change when a car rolls up to the intersection. How does the lightsense the presence of the car?Q # 3Why does an electric light bulb nearly always burn just as you turn on the light, almostnever while the light is shining?