Introduction to Electric Circuits (01:58)
Learn the components of a simple electric circuit and the concept of potential difference, measured in volts. The electron flow from a circuit's negative to the positive terminal is called an electric current, measured in amps.
Resistance and Ohm's Law (01:39)
Learn the concept of resistance, measured in ohms; the equation for Ohm's law; and the equation for power, measured in watts.
Open, Closed and Short Circuits (00:38)
Learn the difference between open, closed and short circuits and associated safety risks.
Series Circuits (01:17)
Learn how series circuits affect voltage drop. With more components, the resistance increases and circuit current decreases. The total power supply is the sum of each component.
Voltage Divider (01:35)
When resistances of different values are connected in a series circuit, the voltage drop across each one is proportional to the resistance of each resistor. View an example and learn how a voltage divider works.
Series Circuit Applications (00:47)
When an appliance is plugged into mains power, it's in a series circuit. View examples of floor heating and simmerstats.
Parallel Circuits (01:14)
A parallel circuit has two or more branches. Learn how more power flows through the branch with less resistance and the total circuit power is the sum of the powers in each branch.
Parallel Circuit Applications (00:45)
Household circuits are wired in parallel to protect against failure. Circuit breakers are triggered if a board is overloaded.
Electrical Circuit Calculations (02:45)
Ohm's law links the current, voltage drop (potential difference), and resistance. View examples of calculations of Ohm's law and the Power law using a triangle graphic.
Kirchhoff's Laws (01:29)
View diagrams and examples of Kirchhoff 's current law, used to calculate the values of currents meeting at a point, and his voltage law, used to calculate the voltage drop across a conductor.
Electrical Circuit Measurements (03:37)
View a demonstration of multimeter functions, including DC voltage, DC current, and resistance measurements.
Learn the function and applications of fixed resistors, including how to read color coded power ratings.
Variable Resistors (02:28)
Learn the function and application of potentiometers, rheostats, light dependent resistors (LDRs), voltage dependent resistors (VDRs), positive temperature coefficient (PTC) and negative temperature coefficient (NTC) thermistors.
Credits: Electrical Circuits (00:35)
Credits: Electrical Circuits
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