Electricity
Types of circuits
Ohms Law
Conductors and Insulators
Circuit symbols
100
An electric circuit is
A pathway for transmitting electric current
100
A series circuit is when
There is only one pathway for the electrons to follow
100
The three units in Ohms law are
Current
Voltage
Resistance
100
An insulator is
a material that prevents or restricts the flow of electric current
100
Draw a globe symbol
teacher to check
200
The flow of charge is called
Current
200
A parallel circuit is when
there is more than one pathway for the electrons to take
200
The formula for Ohms law is
V=IR
200
A conductor is
a material that allows the flow of electric charge (electrons) through it, enabling the movement of electricity
200
Draw this circuit on the board using the correct symbols
Teacher to check
300
The four aspects that are required to make a working circuit
1. Complete loop
2. A source of power
3. Metal wires
4. A load (e.g. globe or resistor)
300
An advantage of a parallel circuit
If one thing breaks, the rest of the circuit continues working
300
The units for current can be
A or I (must say both)
300
An example of an insulator and an example of a conductor
E.g. plastic, rubber
E.g Metal
300
Using the symbols, on the board, draw:
A parallel circuit that has 2 branches with a one globe in each branch. This circuit is powered by a 24V battery
Teacher to check
400
Electricity is like a water hose...explain
Voltage - pressure of water
Current - size of hose
Resistance - sand in the hose
400
Draw the following on the board:
A parallel circuit with 3 branches. Two of the branches have globes and the third has a resistor. In each branches with a globe include a switch so you can turn the globes on or off
Teacher to check
400
Find the voltage if;
I = 2A and R = 10Ω
20V
400
Low resistance to electrical current flow
A characteristic of a conductor
400
A voltmeter is placed
In parallel to the component being measured in a circuit