The basics of Electricity
Current
Amperes
Volt
The volt is the unit of electric voltage
Electrical quantities table
The components of an electrical circuit
Power Source
Alternating Current (AC) and Direct Current (DC)
Resistor
Switch
Resistance is denoted by the Greek letter omega in capitals: (ohm)
Instruments for Measuring Electrical Quantities
Electrical Circuit Components
What the Colors on a Resistor Mean
Not all resistors exert the same amount of resistance on the flow of electrons
Examples of resistor calculation using color codes
Resistor Connections in Electrical Circuits
Prefixes of Units of Measurement
Electrical Circuit Connections
Generally, DC sources are much safer than AC sources.
Ohm's Law
Series and Parallel Circuit Connections
Series Connections
The lower the resistance of a conductor
Parallel Connections
Node
You can find the total resistance of the circuit between points A and B:
We can now consider an equivalent circuit:
In the equivalent circuit, we observe that R3,4,5 and R2 are connected in parallel.
So we consider the following equivalent circuit:
If we connect another identical resistor in series with the first resistor, then the intensity of the current:
When two resistors, R1 and R2 , with different resistances are connected in parallel:
Read the sentences and tick True or False: An ammeter measures voltage.
Match the items in the first column with those in the second.
Determine whether the two light bulbs X1 and X2 will emit the same amount of light? Justify your answer.
Draw the circuit diagram.
Calculate the following: The total resistance of the circuit.
