On a sunny day, a rooftop solar panel delivers 60 W of power to the house at an emf of 17 V. How much current flows through the panel?

Your cell phone typically consumes about  410 mW of power when you text a friend. If the phone is operated using a lithium-ion battery with a voltage of 3.7 V, what is the current (in A) flowing through the cell-phone circuitry under these circumstances?

A physics student has a single-occupancy dorm room. The student has a small refrigerator that runs with a current 4 A, a lamp that contains a 100-W bulb, an overhead light with a 60-W bulb, and various other small devices adding up to 8 w. All the appliances run on a voltage of 110 V. Overall Hint a. What is the total power used by the dorm room (while the refrigerator runs)? Total power used by the dorm room is W. b. Assuming that the power plant for the electricity is 10 km away and uses 00-gauge copper wire (diameter 9.266 mm), how much power is dissipated in transmission (remember to count the return wire), if the power plant is directly providing the 110-V? (To be more precise, the power plant is providing the voltage it needs to provide, so that the voltage at the dorm room is 110 V.) Hint for part (b) Power of W is dissipated in transmission at 110 V. c. The most common way to increase the efficiency of power transmission is by using higher voltage for long-distance transmission…

A capacitor charging circuit consists of a battery, an uncharged 20 μF capacitor, and a 4.0 kΩ resistor. At t = 0 s, the switch is closed; 0.15 s later, the current is 0.46 mA. What is the battery’s emf?

An electric utility company supplies a customer’s house from the main power lines (120 V) with two copper wires, each of which is 150.0 m long and has a resistance of 0.11Ω per 400 m. Find the power delivered to the customer and assume that a load current at the customer’s house is 140 A. 15183W 15992W 40425W 16800W none of the above

Your car battery is dead, and your friends are helping you start your car with cheap jumper cables. One cable carries current from their car to your car, and a second cable returns that current to their car. As you try to start your car, a current of 80.0 A flows through the cables to your car and back, and a voltage drop of 6.00 V appears across each cable. If you replace the cheap cables with cables having half their electric resistance, what voltage drop will appear across each new cable if the current doesn't change? AV= i

A 5.5 A current is set up in a circuit for 6.2 min by a rechargeable battery with a 9.0 V emf. By how much is the chemical energy of the battery reduced?

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?