Ohm’s law: How much current will be flowing through a 40.0 m length of cylindrical metal wire with radius 0.0 mm if it is connected to a source supplying 16.0 V? The resistivity of this metal is 1.68 × 10-8 Ω ∙ m.

Field intensity: A laser with a power of 1.0 mW has a beam radius of 1.0 mm. What is the peak value of the electric field in that beam? (c = 3.0 × 108 m/s, μ0 = 4π × 10-7 T ∙ m/A, ε0 = 8.85 × 10-12 C2/N ∙ m2)

Power: A 400-W computer (including the monitor) is turned on for 8.0 hours per day. If electricity costs 10¢ per kWh, how much does it cost to run the computer annually for a typical 365-day year?

The voltage across the terminals of a 9.0 V battery is 8.1 V when the battery is connected to a 20 

The voltage across the terminals of a 9.0 V battery is 8.1 V when the battery is connected to a 45

The voltage across the terminals of a 9.0 V battery is 8.3 V when the battery is connected to a 45

Phase angle: The phase angle of an LRC series circuit with an inductive reactance of 200 Ω and a capacitive reactance of 100 Ω is 40.0°. What is the value of the resistor in this circuit?

Household wiring often uses 2.0 mm diameter copper wires. The wires can get rather long as they snake through the walls from the fuse box to the farthest corners of your house. What is the potential difference across a 17 m long, 2.0 mm diameter copper wire carrying an 8.5 A current?  (Resistivity of copper = 1.7 x 10-8 

a) How long must a 0.52 mm diameter aluminum wire be to have a 0.44 A current when connected to the terminals of a 1.5 V flashlight battery? (Resistivity of aluminum = 2.8 x 10-8

A water molecule perpendicular to an electric field has 3.70×10−22 J more potential energy than a water molecule aligned with the field. The dipole moment of a water molecule is 6.2 x 10-30 Cm. What is the strength of the electric field?