Other slides in this set
Here's a taster:
Current is measured by an The potential difference is
ammeter (A) and is placed measured with a voltmeter (v) and
in series with the placed in parallel with the
If the resistor is kept at a constant temperature the graph
shows a straight line passing through the origin. This means
the currents is directly proportional to the potential
difference across the resistor.
In a filament lamp, resistance increases
with increase of filament temperature.
In a diode, `forward' resistance is low
`reverse' resistance is high.
In a thermistor resistance
decreases if its temperature
In a LDR resistance decreases if the
light intensity on it increases.
For components in a series:
The current is the same in
The potential differences add
to give the total potential
The resistances add to give Diode Filament
the total resistance Lamp
Current= p.d of supply For components in parallel:
total resistance The potential difference is the same
Potential difference = across each component
current x resistance The total current is the sum of the
currents through each component
The bigger the resistance of a
component the smaller its current is.
Resistance (ohms ) = potential difference (volts V)
current (amperes A)…read more