# Electrostatic Doubler and Generator

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## Introduction: Electrostatic Doubler and Generator

this based on the wonderful device made by Thomas Kim - a living god of Electrostatics

Electrostatic generator made of hard disk platter

it drove me mad for a while trying to work out how it worked.

Here is my not quite as good copy

My Electrostatic Doubler

Here's how I think it works.

### Teacher Notes

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## Step 1: How It Works -

How does it work

https://en.wikipedia.org/wiki/Electrostatic_induct...

http://www.school-for-champions.com/science/static...

Imagine the can on the left is slightly positively charged (just handling the polystyrene will charge it which will induce a charge in the can). This makes the foil pad its connected to by the wire positively charged.

When you put the disks over the foil electrodes, electrons in the disks are repelled by the negative charge in the left hand pad and flow to the other disk by the foil bridge attracted by the positive charge in the pad on the right. When you lift the disks one disk is negatively charged, the other positive.

Step 2

When you touch the disks to the cans , you add some of that charge to the cans. By repeating the process you keep inducing more charge on the disks and the cans.

Step 3

Step 4

The foil clanger gets attracted to the cans, when it touches on, it gets the same charge and is repelled and attracted to the other one (see Franklin Bells).

## Step 2: Two Metal Disks With Plastic Handles

So you need two metal disks . These were from a hard drive but you could cover cd's with aluminium foil with a couple of bits of plastic pipe as holders. I used two little foam sticky pads to hold the hanldes on with.

## Step 3: Influence Electrodes and Connecting Wire

A sheet of plastic (I used a A4 sheet) with two bits of foil 3" circles underneath stuck on . The foil disks are about 3" apart (6 cm)

I had a sheet of see through perspex (acrylic) but you could use a thin plastic cutting board.

The disks are about 2-3 inches (4-5 cm) across.

On the opposite side of the sheet, stick a piece of foil like a bridge between foil disks say 1 cm by 5 cm

It needs to be bare metal on the top so don't cover it in tape. When you touch the disks down it joins them together electrically. Use sticky pads (or glue) underneath the foil to stick it to the plastic sheet.

## Step 4: Drink Cans

Put two drink cans (full are better as they dont fall over so easily) on a plastic sheet or polystyrene blocks

Tape the wire from the opposite foil disk to each can.

Tape a wire to each can from the foil disks, where there is bare metal (no paint) Scratch off the paint if necessary. there may be clear varnish so use some sand paper to be sure of a good connection. I used tape to hold them on.

## Step 5: Clanger

Hang a little ball of foil from a cotton thread from a plastic bar (a plastic tube from a pen or something) between the cans. The cans should be about 2 -3 cm apart.

https://en.wikipedia.org/wiki/Franklin_bells

## Step 6: Charge...!!!!! -

watch the video and charge!!!!!!

If it doesn't work, check you have good connections with the wires (clean the can and foil)

Put the foil, plastic sheet and polystyrene on a central heating radiator or blow some hot air from a hair dryer to make sure there is no moisture leaking charge away. Clean the plastic with cheap after shave or perfume (alcohol) hope it works, if it doesn't then let me know, we can fix it!

Happy sparking!

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