In this unit you will find out:
1- The electric current.
3- Series and parallel circuits.

Electricity is used to
   1. Transport information:
Computers manipulate digital information to produce pictures, sounds, and new data. our bodies have electric circuits - our brain and nerves handle information electrically.
     2. Transport energy.
The electric circuits contains devices for transforming energy. For example, in a torch, energy is transferred electrically from the battery to the bulb, where it is transformed into light and heat. 

Simple electric circuit: 
We use electric circuits to transfer energy from a battery or power supply to components in a circuit, which then transfer the energy to their surroundings. For an electric current to flow we need to things:
1- A complete circuit for it to flow around.
2- Something to push it around the electric  circuit, this push is provided by batteries or power supply. 

Electric circuit components symbols: 

Current in electric circuits:

What is Electricity? and what is the Electric current
In an attempt to answer this questions we may find it useful to compare the behavior of electricity with some thing else. In science we call it Modelling, we try to explain something we don't understand by making a model of it and then investigating a model . 

Press on  Electricity model  to understand what is electricity.

Electricity model & What is Electricity


  Another model of the electric circuit  is:
  A sweet mine, lorries to carry the sweets and a giant to eat the sweets.
 The current (lorries) are seen to carry energy (sweet) to the bulb (the giant); the energy is transferred there by the current.
Create a model of an electric circuit :
  1-  Flowers, nectar, bees, hive 
  2- Dead rat, ants, nest  
  3- Well, buckets, water, village.

Activity no.1


When you connect a light bulb to a battery, the bulb lights up. why does it light? What is going on in the circuit that we can not see? 
This activity will help you to develop a model of what's happening in the electrical circuit, understand what is:

  •   The Electric Current Intensity (I), Voltage(V), Resistance (R). 
  •  The Series and Parallel Circuits. 
  •  Using an Ammeter.
  •  Using an Voltmeter.
  •  Ohm's Law.
    press on the Activity

Electricity and Circuits

  So The electric current is:
  • The measure of how much electric charge is flowing through a circuit.

  • We measure the electric current with Amperes (Amp) by using  Ammeter

  • Current doesn't fade away, It's always the same throughout the circuit.

Note that: 
The conventional current direction is from the (+) positive terminal to the (-)  negative terminal of the cell which is the opposite of the direction of the electrons flow which is from the (-) to the (+)