Problem 4:  Find the power dissipated (in W) in each of the following extension cords:   Part (a)  An extension cord having a 0.095 Ω resistance and through which 5.00 A is flowing.  Part (b)  A cheaper cord utilizing thinner wire and with a resistance of 0.36 Ω through which 5.00 A is flowing.

In a certain stereo system, each speaker has a resistance of 5.00 Ω. The system is rated at 55.2 W in each channel. Each speaker circuit includes a fuse rated at a maximum current of 4.50 A. Is this system adequately protected against overload? Yes/No   Give the current drawn by each speaker to support your answer.

Consider the circuit shown in the figure below. (Let R = 38.00.) 25.0 V 5.00 ΩΣ a 10.0 Ω ww 10.02 ww www 5.00 2 (a) Find the current in the 38.0-0 resistor. R 4 (b) Find the potential difference between points a and b V ℗

A student set up the circuit shown for her electronics class. Assuming Ɛ = 7.60 V and R = 4.70 Q, find the following quantities. 12.0 V + 4.00 Ω b 2.00 Ω ww a w R ε (a) the current in the 2.00 2 resistor (Enter the magnitude in mA.) Redraw the circuit, labeling currents, and apply Kirchhoff's rules to determine equations in terms of the given values. Solve your equations for the current in the 2.00-Q resistor. mA (b) the potential difference (in V) between points a and b Vb-Va = Apply Ohm's law and your result from part (a) to calculate your answer. It might help to redraw the circuit so that points a and b are clearly defined junctions. V Need Help? Read It

A circuit consisting of 5 resistors is shown in the graph. Their resistances are R1 = 16 Ω, R2 = 55 Ω, R3 = 97 Ω, R4 = 63 Ω, and R5 = 23 Ω, and the emf of the battery is ε = 5.5 V. Suppose the internal resistance of the battery is zero. Express the power P dissipated by R1 through I and R1.

27.7

In an experiment on muscle a voltage of 6.64 V is applied, resulting in a current of 57.1 mA.  What is the resistance of this muscle, in Ω? What voltage is needed to supply 593 mW of power to a 2.64 kΩ resistor?

Consider the following figure. 4.00 Ω a 7.00 Ω R 9.00 Ω (a) Find the equivalent resistance between points a and b in the figure. (R = 18.0 (2) |Q (b) Calculate the current in each resistor if a potential difference of 60.0 V is applied between points a and b. I (4.00 (2) = A I (7.000) = A I (18.00) = A I (9.000) = A

The cord from an appliance is too short to reach the wall outlet in your room. You have two extension cords to choose from. a) Find the voltage drop in the first extension cord having a 0.0780 Ω resistance and through which 7.60 A is flowing. b)The second extension cord is cheaper and utilizes thinner wire. It has a resistance of 0.780 Ω and the current flowing through it is 7.60 A. By what amount does the voltage supplied to the appliance change when the first extension cord is replaced by the second?