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A 20.0 - µF capacitor is charged to 200 V and is then connected across a 1000-Ω resistor. What is the initial current just after the capacitor is connected to the resistor? (in mA)
A resistor develops heat at the rate of 20W when the potential difference across its ends is 30V. What is the resistance of the resistor?
A proton enters a region of uniform electric field E = 320 N/C at time t = 0 with velocity Vi=3.70x106 m/s perpendicular to the electric field. The horizontal length of the plates that produce the uniform electric field is l = 0.143 m. What is the time it takes for the proton leaves the field?
How much power does the phone take in standby mode when its operating time is 240 h?
What is the resistance (impedance) of a 3 x 10^-6 farad capacitor powered by an AC power supply with a frequency of 60 Hz?
A lithium-ion battery of a GSM mobile phone has a voltage of 3.6 V and an electrical amount of 900 mAh. How long is the battery life in talk mode when the phone draws 300 mA?
What is the current produced by the solar cells of a pocket calculator through which 6.00 C of charge passes in 5.00 h
Why do the light on the car become dimmer when the starter is opened?
Three impedances each of (3-j4) ohm are connected its delta to a 230V, 3-phase, 50 Hz balanced supply. Calculate the live and phase currents in delta connected load and the power delivered to the load.
47 μF capacitor is charged to 6.0 V and then discharged through a 1.0 MΩ resistor.
Calculate the inital current and time constant
