The atomic structure of a metal can be describe as
Current is
Convential current goes from negative to positive
The higher the electric potential the more energy can be converted to electron movement (electric current) when there is a closed loop
For Current to be present in a circuit
The voltage or potential diffence is inversely proportional to the current generated by it
Resistance is
There is a division of voltage across each branch of circuit components that are in series.
The effective resistance of the components in series will be smaller than the largest resistance in the series circuit (all are added together).
The total voltage (electrical potential energy) supplied to the circuit.
One way of finding the Electromotive Force is by adding all the voltages/potential differences dropped across each component in a circuit.
Calculate the current passing through a wire which has a potential difference of 27V flowing through a resistor of 3Ω
Calculate the current in a circuit consisting three resistors: 3Ω, 2Ω & 4Ω and a supply voltage of 27V.
If there is a break (loose wire) in a series circuit then no current will be in the circuit.
The effective resistance of the components in parallel will be less than the smallest resistance in the parallel configuration.
There is no division of voltage across each branch of circuit components that are in parallel.
Kirchoff's Current Law states
Calculate the value of i3
Calculate i4
When finding the resultant resistance in a Series/Parallel circuit always resolve parallel loops/branches before tackling series components.
Caculate the Total resistance when switch S1 is open.
Calculate the total resistance when switch S1 is closed
Calculate the total resistance in the circuit above
Calculate the voltage drop across resistor R1
Calculate the voltage drop across resistor R5