Kirtchoffs first law

Sum of current into a junction is equal to current out

The number density of a material

Is the number of free electrons per cubic metric (how good a conductor is it)

If a wire is made thicker how will this effect the mean sift velocity

It slows the mean diff velocity as the particles aren’t tunnelled :directed as much

Define one volt

V= W/Q

The of pd across a component when 1 house is transferred per coulomb

Define one ohm

The resistance of a component when one volt is needed to move one amp of current through it

Ohms law

Voltage and current are directly proportional for a metallic conductor at constant temp

Which of these are ohmic?

Resistor

Filament

Diodes (LED)

Resistor

What Negative temperature coefficient?

Thermistor as it acts weird and resistance decreases with heat

Define resistivity

The product of the resistance and the cross sectional area or a component made of the given material dived by its length

Kirtchoffs evening law

In a closed loop the sum of the emf equals the sum of the pd

Define a progressive wave

An oscillation that travels transferring energy

Define a longitudinal wave

A wave that the transfer of energy is parallel to direction of motion

Transverse wave

The oscillations are perpendicular to the direction of energy transfer