Electrodynamics and circuits definitions

Question 1

Potential difference

Answer 1

the work done per unit positive charge

Question 2

current

Answer 2

the rate of flow of charge

Question 3

Ohm’s law

Answer 3

The current though a conductor is directly proportional to the potential difference across the conductor at constant temperature

Question 4

Resistance

Answer 4

a material’s opposition to the flow of Electric charge

Question 5

Electrical power

Answer 5

… dissipated in a device is equal to the product of the potential difference across the device and the current flowing through it

Question 6

Emf

Answer 6

The total energy supplied per coulomb of charge by the cell

Question 7

Magnetic flux density

Answer 7

a representation of the magnitude and direction of the magnetic field

Question 8

Magnetic flux linkage

Answer 8

the product of the number of turns on the coil and the flux through the coil (Nphi)

Question 9

Faraday’s Law of Electromagnetic induction

Answer 9

The emf induced is directly proportional to the rate of change of magnetic flux

Question 10

Lenz’s Law

Answer 10

The induced current flows ina. Direction so as to set up a magnetic field to oppose the change in magnetic flux

Question 11

Diode

Answer 11

A component that only allows current to flow In one direction