I need help answering Each and every question (ALL) if possible please. How much

Question

I need help answering Each and every question (ALL) if possible please.

How much does it cost to operate a 40 W light bulb operating on a 120 V line continuously for one year (365 days) if the electric power company charges $0.12/k Wh? What is the equivalent resistance for these 3.00-Ohm resistors? A 20-Ohm platinum wire at 20 degree C with a temperature coefficient or resistivity of 3.9 times 10^-3 (degree C)^-1 will have what resistance at 100 degree C? A wire has a current of 6.0 mA in it. How many electrons pass a given point in a minute? Two 20 ohm and one 55 ohm resistor are all connected in parallel. The equivalent resistance of the combination is ___ohms. Resistors of values 6.0 Ohm, 4.0 Ohm, 10.0 Ohm and 7.0 Ohm are com shown. Req? Three capacitors are placed in parallel. Their capacitances are 3 mu F, 6 mu F and 9 mu F. What is their total capacitance in mu F? Identical 2.0 mu C charges are placed on the vertices of a square with sides that are 2.0m in length. Determine the electric potential at the center of the square. A 12 V potential difference is applied across a parallel combination of four 7.0 Ohm resistors. The total current in the circuit is ___ A. A 68 volt potential difference is applied across a parallel combination of a 10 mu F and a 30 mu F capacitor. The charge on the 30 mu F capacitor is ___ mu C.

Explanation / Answer

Number of hours it will operate = 365×24 =8760 hours

Hence energy consumed = 40×8760 = 350400 Wh = 350.4 kWh

Cost = 350.4×0.12= $ 42.048

Top three resistors are in series so their resistance = 3+3+3= 9 ohms

This will be in parallel with 3 ohm resistor

Req = 3×9/(3+9) = 2.25 ohms

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