Ch. 34 & 35 - Ohm's Law

Question 1

potential difference

Answer 1

The difference in electric potential between two points.

Question 2

electric current

Answer 2

The flow of electric charge; measured in amperes.

Question 3

ampere

Answer 3

SI unit of electric current.

Question 4

voltage source

Answer 4

A device, such as a battery or generator, that provides a potential difference.

Question 5

electric resistance

Answer 5

The resistance of a material to the flow of electric current through it; measured in ohms.

Question 6

superconductivity

Answer 6

A property of a material that has infinite conductivity at very low temperatures, so that charge flows through it without resistance.

Question 7

ohms

Answer 7

The SI unit of electric resistance.

Question 8

Ohm’s law

Answer 8

States that the current in a circuit is directly proportional to the voltage impressed across the circuit, and is inversely proportional to the resistance of the circuit.

Question 9

direct current

Answer 9

Electric current whose flow of charge is always in one direction.

Question 10

alternating current

Answer 10

Electric current that repeatedly reverses direction, twice each cycle.

Question 11

diode

Answer 11

An electronic device that restricts current to flow in a single direction in an electric circuit.

Question 12

electric power

Answer 12

The rate at which electrical energy is converted into another form, such as light, heat, or mechanical energy (or converted from another form into electrical energy).

Question 13

circuit

Answer 13

Any complete path along which charge can flow.

Question 14

in series

Answer 14

Term applied to portions of an electric current that are connected in a row so that the current that goes through one must go through all of them.

Question 15

in parallel

Answer 15

Term applied to portions of an electric current that are connected at two points and provide alternative paths for the current between those two points.

Question 16

series circuit

Answer 16

An electric circuit in which devices are arranged so that charge flows through each in turn. If one part of the circuit should stop the current, it will stop throughout the circuit.

Question 17

parallel circuit

Answer 17

An electric circuit in which devices are connected to the same two points of the circuit, so that any single device completes the circuit independently of the others.

Question 18

schematic diagram

Answer 18

A diagram that describes an electric circuit, using special symbols to represent different devices in the circuit.