1. A charge of 1020 C was passed through a wire in 5.5 min. What was the average electriccurrent during that interval?

2. How long does it take for 67 C to pass a given point in a wire that carries an electric current of 0.80 A?

3. What is the potential difference across a 220 ohm resistor when a current of 3.50 A flow through it?

4. A piece of Nichrome wire passes a current of 0.853 A when a potential of 1.64 V is applied. What is the resistance of the wire?

5. Calculate the resistance of a piece of 20-gauge copper wire 2.00 m long. The cross-sectional area of 20-gauge wire is 0.5176 mm^2.

6. Compute the resistances of 18-gauge and 16-gauge copper wires of 5.00 m long. The cross-sectional area of 18 gauge wire is 0.8231 mm^2, and that of 16 gauge wire is 1.309 mm^2.

7. A flashlight lamp connected to battery that provides 1.4 V draws a current of 0.10 A. What electric power is used by the lamp?

8. A 150-W street lamp is operated for 12 hours a day. How much energy does it take to operate the lamp for 30 days? Express your answer in kilowatt-hours and in joules.

Solution Preview

1.)
Charge Q = 1020 C
time t = 5.5 min = 5.5*60 = 330 sec
Because, current
I = Q/t = 1020/330 = 3.09 == 3.1 Ampere --Answer

2.)
Electric current I = 3.50 A
Charge Q = 67 C
Therefore, time
t = Q/I = 67/3.5 = 19.14 sec --Answer

3.)
Resistance R = 220 ohm
current I = 3.50 A
Potential difference V = I*R = ...

... Kirchoff's circuit laws, electrical engineers have proposed the equation dI/dt=-R/L I+U/L for describing the time dependence I(t) of the electric current. ...

... If a coil is placed in between these magnetic poles and rotated, the magnetic forces will be disturbed and this event will produce electric current on the coil ...

... of the combination in the electrical circuit ...Current starts flowing through the resistors in parallel ... each resistor, from Ohm's law different currents will flow ...

Assistance is requested with the following electric circuit questions ... A and B. So sum of currents at A ... That means current coming at junction A = current going ...

Use a copy of the most recent annual report for General Electric. ... to discussing the changes in the dollar amounts reported in the current annual reporting ...