Fundamentals of Physics Study Set 2

A car battery is rated at 80 Ah.An ampere-hour is a unit of:

Current has units:

Current has units:

Current is a measure of:

A 60-watt light bulb carries a current of 0.5 ampere.The total charge passing through it in one hour is:

A 10-ohm resistor has a constant current.If 1200 C of charge flow through it in 4 minutes what is the value of the current?

Current in a conductor is normally due to:

This figure shows a junction.What is true of the currents?

In schematic diagrams, currents are indicated using arrows.What do the arrows indicate?

Conduction electrons move to the right in a certain wire.This indicates that:

If is the current density and is a vector element of area then the integral over an area represents:

Two wires made of different materials have the same uniform current density.They carry the same current only if:

A wire with a length of 150 m and a radius of 0.15 mm carries a current with a uniform current density of 2.8 10⁷ A/m².The current is:

In a conductor carrying a current we expect the electron drift speed to be:

The current is zero in a conductor when no potential difference is applied because:

The current density is the same in two wires.Wire A has twice the free electron concentration of wire B.The drift speed of electrons in A is:

Copper contains 8.4  10²⁸ free electrons per cubic meter.A copper wire of cross-sectional area 7.4  10^-7 m² carries a current of 1 A.The electron drift speed is approximately:

The units of resistivity are:

If the potential difference across a resistor is doubled:

A current of 0.5 ampere exists in a 60-ohm lamp.The applied potential difference is: