Electric Circuits Answers

Find the currents and voltages in the circuit shown in Fig. 2.28.

A triangular array of resistors is shown in the figure on the right. What current will this array draw from a 35,0V battery having negligible internal resistance if we connect it across

a.) ab; b.) bc and

c.) ac?

A 12-V battery, a 12-ohm resistor and a 4-ohm resistor are connected as

shown. The current in the 12-ohm resistor is ____ that in the 4-ohm resistor.

A battery with a terminal voltage of 12V is connected to a circuit consisting 

of four 10 Ω and one 5 Ω resistor all in series. Assume the battery has 

negligible internal resistance. Calculate the current through each resistor.

An electrician experienced a mild shock when he accidentally touched a wire carrying 5.0 A for 1.5 s.

a.) How many coulombs of charge flow through the electrician?

b.) How many electrons constitute the given current?

The circuit in the figure on the right shows a network of resistors

connected in series and in parallel.

(a) Determine the total resistance of the network.

(b) What is the current through the 3.00-Ω?

A 32.0-Ω resistor and a 20.0-Ω are connected in parallel, and the combination is applied

across a 240 V dc line.

(a) What is the resistance of the parallel combination?

(b) What is the total current through the parallel combination?

(c) What is the current through each resistor?

A 60W-100V tungsten lamp has a resistance of 20 ohms at air temperature (0◦C). What is the rise in temperature of the filament under normal working conditions? The temperature coefficient of resistance of tungsten is 0.0052/◦C.

An electron is placed midway between two parallel horizontal conducting plates 2.0 cm apart in air. What must be

the potential difference between the plates for the electrons to remain stationary? What

must be the sign of the charges in each plate?

Two long, parallel wires are attracted to each other by a force per unit length of 440 𝜇𝑁/𝑚

when they are separated by a vertical distance of 0.80 m. The current in the upper wire is

13.0 A to the right. Determine the location of the line in the plane of the two wires along

which the total magnetic field is zero.