1. The CURRENT in a circuit between two points is directly proportional to the VOLTAGE across the two points, and inversely proportional to the RESISTANCE between them Georg Simon Ohm (16 March 1789 – 6 July 1854) was born in Erlangen, Bavaria. He worked as a mathematics lecturer, and as a physics teacher. Being the son of a locksmith he was able to build equipment to research the recently invented electrochemical cell. These experiments resulted in the discovery of Ohm's Law. PUMP CURRENT CONSTRICTION WATER CIRCUIT Ohm’s Law I = V / R IN PLAIN ENGLISH The speed that electrons travel around a circuit is influenced by how fast they are being pumped and how much they are slowed down by the blockages V I R V Voltage Unit: Volts The potential difference in charge between two points in an electrical field. I Current Unit: Amps The rate of flow of electrons in a circuit. R Resistance Unit: Ohms The opposition that a substance offers to the flow of electric current.

2. Cell Supplies electric energy, The positive (+) terminal is on the left, the negative (-) is on the right Switch When turned off it stops the flow of electrical current, when turned on it lets the current flow Resistor Slows down electric current in direct proportion to the voltage of the circuit Capacitor Can store small amounts of electrical charge, like a water container in a pipe Diode Like a one-way valve, it allows electric current to flow in one direction L.E.D. A diode which converts electrical energy to light.

3. Types of Resistors