# Introduction To Electronics

## Important People In Electricity History

Thomas Edison
Nikola Tesla
Georg Ohm
Heinrich Hertz
Andre Marie Ampere
Alessandro Volta
James Watt

## Vocabulary

• Resistance
• Direct current
• Alternating current
• Volt
• Watt
• Ampere

## Intro

The electricity and electronics we use today aren't the same as it was 100 years ago. Back then, people used kerosene lamps to light rooms, and iceboxes were used to keep food cold. To keep rooms warm and to cook, a fire was used. A coal stove was also something used to cook. All that and more changed when Benjamin Franklin went out with a key attached to a kite, one stormy night in Philadelphia. Ben had hypothesized that lightning was an electrical phenomenon, and he was right. Ben took a kite, attached a key to it, then put the string in a Leyden jar, which was used to store electricity back then. That was the first of many experiments to prove that electricity occurred in nature. Nowadays, now we know it's true and use it in our everyday lives, whether you know it or not.

He made one of the most significant discoveries in electricity, electromagnetic induction. dealt with how electric cons work.. Many inventions would come from his experiments but they would come 50 to 100 years later. The farad,the unit of capacitance.

## Thomas Edison

Thomas Alva Edison was an American inventor and businessman. He developed many devices that greatly influenced life around the world, including the phonograph, the motion picture camera, and a long-lasting, practical electric light bulb.

## Nikola Tesla

He envisioned a world without power lines and poles. His system triumph to make possible the first large scale hydroelectric plant, Harnessing Niagra Falls in 1886.

## Albert Einstein

Einstein's formula proved one gram of mass can be inverted into a large amount of energy. E=energy, M= mass, C=speed of light squared meant that 186,000 squared would mean that it would take a small amount of mass to produce a large amount of energy.

## Electricity

It was first discovered when amber was rubbed against a cloth and electrons were exchanged, by the Greek. Now we have resistors and ways to measure electricity. Voltage is measured in volts, current is measured in amps, and resistance is measured in ohms. You can use Ohm's Law to calculate them. Ohm's Law is I=V/R, where I is the current in amperes, V is the voltage measured in volts, and R is the resistance measured in ohms.

## Resistance

A resistor is put in a circuit to keep it from exploding.