Advantages of parallel circuits:
Advantages of series circuits:
Notes on current:
in the bellow diagram the red box could represent a wire, a bulb, a resistor or a diode.
By changing the resistance of the variable resistor the graphs are reproduced.
Since V = IR, as you increase the resistance in a circuit, the current will decrease.
LDR
As illumination increases, resistance decreases
Thermistor
As temperature increases, resistance decreases.
A lamp can be added to a circuit to check for a current. If current is flowing, the lamp will light up.
Potential difference (V) = Current (A) x Resistance (Ω)
current is rate of flow of charge so I=Q/t
Charge (C) = Current (A) x Time (s)
Electrons are negatively charged and free to flow in a metal so carry charge
At a junction current ‘splits’ to take both paths.
It comes back together when the paths meet again.
I1 = I2 + I3 +I4
VT = V1 + V2
IT = I1 = I2
RT = R1 + R2
Energy Transferred (J) = charge (C) x Voltage (V)
