Physics Homework Solutions

Energy of capacitor

We want to store sufficient energy in a .01-F capacitor to supply 5-hp for 1 hour. To what voltage must the capacitor be charged? (1 hp=745.7 watts). Does this seem to be a practical method for storing this amount of energy? Do you think that an electric automobile based on capacitive energy storage is feasible?

Calculate the power delivered to each resistor

Calculate the power delivered to each resistor in the attached .jpg. Please show all work. Thanks.

Resistors

Three resistors of resistance 2,4,10 ohm respectively are connected a) in series with a 12V supply b) in parallel across a 12V supply 1) In each case draw a circuit diagram and determine the current through each resistor and the potential drop across each resistor 2) Determine the power dissipated in the 10 ohm resistor ...continues

Power/current required

An X-ray machine operates from a 220V supply. The machine power is 800W and the supply must also supply six 24W, 220V indicator lights. Please answer all questions with full explanations thankyou 1) What is the total power required? 2) What is the current drawn from the 220V supply? 3) A transformer with 250 turns in ...continues

Circuits

Please answer the following questions (attached) with full explanations thankyou.

Electric Potential and Electric Potential Energy

A typical 12 V car battery can deliver 9.0 x 10^5 C of charge. If the energy supplied by the battery could be converted entirely to kinetic energy, what speed would it give to a 1200 kg car in m/s?

Bits in powerlab

The specification for a Powerlab indicates that for a particular setting of the device, the inputs have a range of +/- 10 volts and a resolution of 312.5uV. Given this info, how many bits is the A/D in the Powerlab?

In the circuit below how long does it take for the current to drop to 1 uA when the switch is moved from position A to B. (Assume that it has been at A for a long time)

In the circuit below how long does it take for the current to drop to 1 uA when the switch is moved from position A to B. (Assume that it has been at A for a long time)

Capacitors and derivations

I am confused on specific calculations only. the derivations. scan003.jpg part 1 a). the derivation scan003.jpg part 1 c). the derivation scan0004.jpg a). the derivation I have an limited understanding of how to derive current, but with being weak in math, these derivations do not seem obvious to me. Please include as man ...continues

Capacitance

Part e... if my measurement for part b is1.03 s , 12.02v and my measurement for part d is1.72 s, 3.78 v...I'm so lost at combining these calculations. and scan4.jpg, part b. is this similar to part a? i think i'm missing some math here.

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