Q8. If electricity costs 10 Bz per kilowatt-hour, how much does it cost to operate a 220 V air conditioner that draws 30 A of current for 12 hours per day for 30 days?

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…

6. Consider the combination of resistors shown in Figure P18.6. (a) Find the equivalent resistance between point a and b. (b) If a voltage of 35.0 V is applied between points a and b, find the current in each resistor. 1 12.0 N 4.00 N a 5.00 N 6.00 N 8.00 N Figure P18.6

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

With a 1200 W toaster, how much does it cost to make a slice of toast (cooking time = 1.5 minute)? Electricity costs 8 cents per kW.h. cents

If electrical energy costs $0.12 per kilowatt-hour, how much do the following events cost? (a) To burn a 120-W lightbulb for 24 h. $ (b) To operate an electric oven for 6.6 h if it carries a current of 20.0 A at 220 V. $

Diagram of the problem, necessary formulas, clearance and numerical solution. An electric light bulb is marked 40 W - 120 V. What is its resistance when it is lit from a 120 V source?