electricity

what is charge(Q) measured in

coulombs (C)

what is current(I) measured in

amps/amere (A)

what is time(t) measured in

seconds (s)

what is resistance(R) measured in

ohms (Ω)

what is power(P) measured in

watts (w)

what is energy(E) measured in

joules (j)

what is potential difference(V) measured in

volts (v)

how to you calculate the resistance of components in series

R= R1+R2 etc.

how do you calculate the resistance of components in parallel

1/R= 1/R1+1/R2 = 2/R =R/2

what is current

current is a flow of charge

what is the e.m.f.

energy supplied or work done by a source, per unit of change, in a complete circuit

what is e.m.f. measured in

coulombs because it is the energy supplied

how do you calculated current

I=Q/t I=V/R

how do you calculate power

P=IV P=E/t

how do you calculate energy

E=IVt E=Pt

junction of conductors

cell

battery

power supply

switch

ammeter

voltmeter

lamp

resistor

variable resistor

potential divider

LDR

thermistor

fuse

heater

bell

buzzer

relay coil

magnetism coil

galvanometer

transformer

diode

what is potential difference

the energy or work done by a charge passing through a component

what is ohms law

current is proportional to potential difference at a constant temperature

is resistance proportional to length

yes

the longer the resister, the higher the resistance

is resistance proportional to the cross sectional area

no, it is inversely proportional

wider the cross sectional area, lower the resistance

LDR and resistance

the brighter, the lower the resistance

thermistor and resistance

the hotter, the lower the resistance

are all objects charged

yes, they are usually neutral

what charges can move

electrons (negative charges)

what is an electric field

region is space where an electric force can be felt

what does the electric field look like on two opposite plates

which way does current and the electrons flow in a circuit

the current from + to -

the electrons from - to +