Electrical circuits Definition and 62 Threads

Homework Statement In the circuit below, C1 = 5 microfarads, C2 = 10 microfarads and R = 1000 ohms. Initially, the switch is open, C1 is charged to 20 volts, and C2 is uncharged. At time t=0 the switch is closed. I think I managed to solve the first two but I have troubles with part (c)...

Homework Statement A student is asked to supply an electric motor with 1.0 mA of current at 3.0 V potential difference. a. Determine the power to be supplied to the motor. b. Determine the elctrical energy to be supplied to the motor in 60s. c. Operating as designed, the motor can lift a...

Homework Statement [PLAIN]http://img688.imageshack.us/img688/1452/45481808.png Find I at all branches. Homework Equations \sum I=0 for a junction. \sum V =0 for a closed loop. The Attempt at a Solution I found the solution but I don't understand why they chose certain...

Hi. Something which has been bugging me a bit lately, is this: I've learned at school that from P=V*I and V=IR, we can insert the second equation in the first, and get P=I^2*R. This equation shows (probably amongst more things) that the power emitted in a wire is the square of the current, and...

Homework Statement Suppose that a battery of emf E and internal resistance r is being recharged: another emf sends a current I through the battery. Why rate is electrical energy being converted into chemical energy? Homework Equations P=EI-I^2*r V=E-Ir I know that since it is...

1) What is the pattern for how voltage gets distributed in a series circuit with equal resistances? what about with unequal resistances? 2) What about in a parallel circuit for equal resistances? with unequal resistances? In either scenario, is there any relation btwn the size of resistance...

Hi, I'm a CS student but I'm taking some EE courses. This semester I had my first two courses in EE: systems and control (basically analysis of electrical networks, discrete and continuous systems, basic control systems and introduction to signal analysis) and digital logic (combinatorial...

i am just about to start an electrical course at college and I've been reading up on some mathematics i will need when i start my problem is i don't know much about compound angles and trig and i want to complete some examples within a book the following problem is the one i need help with...

Homework Statement Homework Equations P = IV V = IR The Attempt at a Solution I know how to solve the problem once i figure out which parts are parallel and which parts are series. So would it be R2 and R3 are in parallel and R4 is series, but what about R1? i have done a...

In an electrical circuit, when current flows through a resistance, heat is produced. Is there some quantity (?) into which heat is transformed when it flows through a substance (all substances having some resistance to heat flow)?

I have a limited knowledge of electrical circuits and recently it got put to test. I live in Arizona and the A/C on my house quit. I found that the condensing fan motor had siezed This is what was in the unit. 1/5 hp, 825 RPM 208-230 vac, 1.1 amp with a 7.5 ufd capacitor. The local...

Could someone please give me a QUALITATIVE description of: -critical damping -over damping -under damping So I can understand the physics behind the oscillatios in a circuit. I know the mathematical explanations (ie. over damping is when the characteristic polynomial solutions are both...