Four identical bulbs, each with a filament resistance of 146 Ω, are connected to a 45-V battery as shown in the diagram below. S1, S2, and S3 represent switches. (a) If S1 and S2 are closed while S3 is open, what is the current through each bulb? bulb 1     A bulb 2     A bulb 3     A bulb 4     A (b) If S3 is closed while S1 and S2 are open, what is the current through each bulb? bulb 1     A bulb 2     A bulb 3     A bulb 4     A

A 12.0 V battery is hooked up with three resistors (R1, R2, and R3) in parallel with resistances of 20.0 Ω, 75.0 Ω, and 100.0 Ω, respectively. Draw a labeled circuit diagram for the circuit described using correct symbols. (Use computer drawing tools or hand draw, scan and copy and paste.)   Calculate the equivalent resistance.     Calculate the current passing through each resistor in the circuit.

In the circuit shown in the diagram below, two thick wires connect a 1.7 volt battery to a Nichrome (NiCr) wire. Each thick connecting wire is 17 cm long, and has a radius of 11 mm. The thick wires are made of copper, which has 8.36e+28 mobile electrons per cubic meter, and an electron mobility of 0.00434 (m/s)/(V/m). The Nichrome wire is 8 cm long, and has a radius of 2 mm. Nichrome has 9e+28 mobile electrons per cubic meter, and an electron mobility of 7e-05 (m/s)/(V/m). [Copper What is the magnitude of the electric field in the thick copper wire? ]V/m What is the magnitude of the electric field in the thin Nichrome wire? v/m Nichrome Copper

One of the circuits in a portable CD player operates on a current of 2.5 mA. How many electrons enter and leave this part of the player in 1 sec?

Consider the following circuit diagram. The potential difference across the battery is 40.0 volts, and it supplies a current of 5.00 amperes to the circuit. There is a current of of 2.70 amperes flowing through R1. Resistor R2 has a resistance of 5.50 ohms. What is the resistance of R3? Answer in ohms to two decimal places, but do not include units in your answer.

The figure below shows five resistors and two batteries connected in a circuit. What are the currents I1, I2, and I3? (Consider the following values:  R1 = 1.20 Ω, R2 = 2.16 Ω, R3 = 3.19 Ω, R4 = 4.18 Ω, R5 = 6.18 Ω.  Due to the nature of this problem, do not use rounded intermediate values in your calculations—including answers submitted in WebAssign. Indicate the direction with the sign of your answer.)I1=?I2=?I3=?

In the circuit indicated in the figure, the battery has an internal resistance of 0.04 Ω. If an ammeter with a resistance of 0.04 Ω is inserted into node “a”, what is the reading of said ammeter? a) 10 Ab) 0.1 Ac) 190.1 Ad) 10.27 A