Circuits

Cards (12)

rules for a series circuit
current is the same throughout a circuit and voltages add up to the supply voltage
rules for a parallel circuit
voltage is the same across each branch and the sum of the currents in each branch is equal to current in supply
how is ammeter connected
must be connected in a series
how is voltmeter connected
must be connected in a parallel
what is IV characteristic of resistor or wire
I is proportional to V as R is constant
what is IV characteristic of filament lamp / bulb
R varies with V for a lamp because temperature is not constant
what is IV characteristic of a bulb
R varies with a positive and negative voltages for a diode and that normally a diode will not conduct until a particular voltage (0.6V) is reached.
what is the purpose of a variable resistor
changes the resistance of the circuit to allow a series of reading to be taken
what does adding resistors in a series do to a circuit
increases total resistance in a circuit
what does adding resistors in a parallel do to a circuit
decreases total resistance in a circuit
how does a thermistor work
as temperature increases, resistance decreases
how does an LDR work
as light intensity increases, the resistance decreases