CURRENT
what is the formula for current which includes voltage and resistance?
I = V/R
is current same or shared in series circuits?
same throughout
define potential difference
the work done (or energy transfer) per unit charge
formula for resistance
R = V/I
DEFINE CURRENT
the rate of flow of electrons
what does graph of current versus pd look like for diode?
drawn out
formula relating power, current and pd
P = IV
what is a superconductor
has 0 resistivity at and below a certain temperature
what is the unit for current?
Ampere (A)
is voltage shared or same throughout a series circuit
shared throughout
if 30J of work done is done when 5C of charge passes through a component, what is the pd?
6V
units for resistance
ohms
symbol of resistor
check
what is the convention for the direction of current in a circuit?
positive (+) to negative (-)
what happens to resistance of LDR with increasing light intensity
resistance decreases
electrical energy produced per unit charge through the source
what happens to resistance of metal with increase in temperature?
resistance increases
if pd = 12V and thee charge passing through = 3C, how much energy is transferred
W= VQ = 12X3= 36J
what is the current when the charge is 10C and the time taken is 10s?
Q/t = 10/10 = 1A
what does graph of current against pd for a wire look like
straight line through origin, increasing as pd increases
what is the difference between potential diference and voltage
none
resistivity formula
p = RA/L
symbol for light-emitting diode
check