Lesson 5 Current, Resistance, Potential Difference

Free electrons can move easily in

• Conductors

• Atoms

• Materials

• Insulators

A rate of 1 coulomb per second is called 1

• Ampere

• Joule

• Volt

• Ohm

For most conductors, increasing the temperature increases the

• Number of free electrons

• Current

• Voltage drop

• Resistance

The difference in potential energy, per unit of charge, is called

• Voltage

• Voltage drop

• Potential

• Potential difference

To maintain a current between two points, you must maintain the

• Voltage source

• Battery

• Potential difference

• Amperage

Resistance is measured in

• Amperes

• Volts

• Watts

• Ohms

The simplest kind of electrical meter to read is the ___ meter.

• D'Arsonval

• Digital

• Pointer

• Dial

In an ammeter, most of the current is going through the meter goes through a special resistor, called the

• Shunt

• Shoot

• Shuttle

• Slope

A voltmeter includes a special resistor called the

• Limiting resistor

• Series resistor

• Parallel resistor

• Shunt

If a path has two resistors, one 20 Ω and the other 30 Ω, and a potential difference of 50 V is applied across the whole path, what is the voltage drop across the 30 Ω resistor?

Ω = ohm

• 50 V

• 30 V

• 20 V

• 15 V