Question

(1)(A)What is the hot resistance of a 41.0 W light bulb with a tungsten filament that runs on 120 V AC? If the bulb's operating temperature is 2700°C, what is its resistance at 2620°C? The temperature coefficient of resistivity of tungsten is 4.50 10^-3 °C⁻¹.

(B)An AC voltage source and a resistor are connected in series to make up a simple AC circuit. If the source voltage is given by V = V₀ sin(2πft) find the first time after t = 0 when the instantaneous voltage of 57 Hz AC first reaches the following values. V = V₀/2, V = V_{0, v=0}

(C)What is the resistance of a 210 Ω, a 2.50 kΩ, and a 4.05 kΩ resistor connected in series? What is the resistance if they are connected in parallel?

Answer 1