Power dissipated Definition and 69 Threads

hello Find the power dissipated in the (6 ohm) resistor. the circuit is in the attachments i know that P in the resistor = (i^2)*R but how can i find the current in that 6 ohm resistor? thanks

Homework Statement A zener diode runs off 10V and supplies 5V to a load that draws 100mA. The minumum zener current = 5mA. R = 47Ω What is the dissipation in the resistor if the output is short-circuited? Homework Equations None. The Attempt at a Solution Using R = V - Vz / Izmin...

Homework Statement In a different RLC circuit the generator provides a voltage V(t) = 120 sin(2π60t) so that the current in the circuit is I(t) = 5 sin(2π60t +Φ). The phase angle Φ is 25° (0.436 radians). What is the maximum power dissipated in this circuit? Homework Equations P = IV...

Homework Statement Using symbols, write PRL, the power dissipated in RL as a function of RL (your other symbols are R0 and the power supply voltage epsilon both of which are constant. 10V and 100ohms) and then take the derivative of this function with respect to RL for which PRL has an extreme...

Homework Statement I understand the maths... I'm here to ask WHY we have to do it this way. The question states: "The power dissipated in a resistor is given by P= E^2/R. If E=200 and R=8 , find the change in P resulting in a drop of 5 Volts in E and an increase of 0.2 Ohms in...

Homework Statement For this sample exam, we are given an RLC circuit, with an alternative emf of 1 V, connected all in series with a 500 ohm resistor, a .4 mH inductor, and two capacitors in parallel of 50 pF each. It asks for the "maximum power dissipated by the resistance" and at what...

Homework Statement A cylindrical cavity oriented along z axis with length of 2 m has a filament in it upon which a current of 10 A is impressed. Cavity is perfectly conducting whereas it is filled with lossy dielectric. Electric field on the cavity is given as: [FONT="Arial...

Homework Statement What is the power dissipated by the 5.0Ω resistor in the following circuit? Homework EquationsI thought maybe to simplify the resistance like. 1/r=1/30 +1/30 r=15 +10+5 R=30ohms then find the current v=ir 25=Ix30 I=.8333 then find power with the 5 ohms? P=vi P=25x5...

Homework Statement How much power is dissipated by the 12\Omega resistor in the figure? PR1=______W How much power is dissipated by the 18 resistor in the figure? PR2=______W Homework Equations P=IV I=\frac{V}{R} The Attempt at a Solution P=\frac{V}{R}*V P=V2/R...

In RL, AC circuit, an AC source vst = 220sin(40000t-45°) is connected to a 60mH inductor and a 3kΩ resistor. Show that the power dissipated in the inductor is zero. The current in this circuit is 0.057A as I calclulated. I know that inductor has no charging role in this circuit. But...

Resistor & power dissipated question--please help Homework Statement Load resistor R is attached to a battery with EMF E and internal resistance r. For what value of the resistance R in terms of E and r will the power dissipated by the load resistor be a maximum? Homework Equations...

Hi all, I'm doing a lab now to determine the relationship between the resistance of a resistor (colour-coded ones) and the energy and power dissipated. What kind of relationship is expected between the variables R and P, or R and E? The way I carried out the lab was to use different...

Homework Statement (See attachment for diagram) Known Values: R1 = 5 R2 = 15 R3 = 25 R4 = 5 V1 = 40 V2 = 20 I1 = 71/7 I2 = 25/7 I3 = 4 1) Find the power dissipated in each resistor 2) Find the power associated with each voltage source including the independent source and...

Homework Statement The corroded contacts in a lightbulb socket have 8 Ω total resistance.How much actual power is dissipated by a 126 W (115 V) lightbulb screwed into the socket? Homework Equations P = I*V I = E/R The Attempt at a Solution I = 115/8 = 14.375 I don't know how to...

Can someone give me a reply Intro Physics style? :D P = IV is known as the "power of the circuit" right? But then, we have questions asking about the heat dissipated by a resistor. We can use P = IV, P=I^2 R , or P=V^2/R to answer such questions Since the voltage drops all add up to...

a charged capacitor has capacitance C and charge Q. a resistor R is then connected what is the power dissipated right after the connection? V=Q/C so P=V^2/R=Q^2/(RC^2) is this right? what is the power dissipated in the resistor when the energy stored in the capacitor has decreased to...

An electric iron marked 1000W, 240V is wrongly connected to a 120V mains.What is the power dissipated by the iron? thanx

Greetings, I recently took an introductory circuits test. The answer key was released today. I am convinced it's wrong, and if my argument is flawed, I'd like to know before bringing it up with the instructor (no, not the professor, the BME guy who appears to apply equations without actually...

An RLC series circuit constists of a resistor of 100 ohm, a capacitor of 10.0uF, and an inductor of 0.250 H. The circuit is connected to a power supply of 120 V and 60 Hz. What is the power dissipated in the circuit? I got 37 W (rounding 2 S.F's) the solutions manual has the answer as 73 W...