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Sun, Nov 25


Roots Cafe

Penny Battery Flashlight Build and Student Competition!

In this class, we will build a flashlight from Penny batteries, a switch, LED (light) and wires.

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Penny Battery Flashlight Build and Student Competition!

Time & Location

Nov 25, 2018, 1:00 PM – 4:00 PM

Roots Cafe, 408G Paulding Ave, Northvale, NJ 07647, USA

About The Event

Welcome to Mr. G's Workshop!

Hi, I am Mr. G, I teach "Industrial Arts" or S.T.E.M. in a New Jersey High School. Now I am offering my class to the public. I have classes on Mechanics, Electronics, and Metal fabrication (Welding).


get tickets here:

SUNDAYS 1-4pm 11/25, 12/2, 12/9

This class is the "Handmade Penny Battery Flashlight Competition"

In this class, we will build a flashlight from Penny batteries, a switch, LED (light) and wires.

I ran this project with my High School students and they enjoyed it... So I would like to offer this you!

Video promo:

Phase 1: The skills

Making a battery from pennies.


Copper ( the outside of the penny)

Zinc ( the inside of the penny)

Electrolyte ( salt water or vinegar)


0.8 volts per cell

Goal in 3.2volts

Mr.G Penny Battery video:

Soldering wires to pennies

Soldering is like gluing with liquid metal

Cutting wires to links and stripping the outer coating

Mr.G Soldering video

Soldering wires to LED

Soldering LED’s (lights)

Completing the Flashlight circuit (Parts)

3 wires

1 led

1 switch

1 Battery

Flashlight Circuit video


Scroll down for Phase 2:The 5 foot Drop Test! And weight in competition.

Phase 2:The competition

Penny battery flashlight rules and competition Fall 2018

5 foot Drop Test! And weight in competition.


3 wires (that are connected to complete the circuit)

1 led (Must see the Head out or through a window)

1 switch (Must stay on and stay off) (no "Momentary Switch")

Battery (optional penny battery, or bought)


Must be in a rigid container with at least 5 sides. (a box has 6)

All sides can have “windows” or holes.

Tape can only be used to attach or close, Not to be the shape.

Definition of “rigid container “:

It holds its own shape, meaning it does not take the shape of the circuit or parts.

(like tape does)

No wires outside container

Must be able to open one door for inspection. (or clear) (6th side)

Penny battery flashlight 5 foot drop test:

5 feet from the ground, in front of the class, after the drop you have to pick up the flashlight and turn it on. Video Sample:

Video Assignment Rules:

1. The video has to be at least 30 seconds long, and can not be longer than 1 minute.

2. Introduce yourself:

(Hi, I am _______, We are at Mr.G’s Workshop and This is my Flashlight Project…)

4. When you drop it you have to count down 3, 2, 1.

5. Light has to be turned off when you drop it.

6.The background has to be clean.

7. After the drop, pick it up and turn it on.

8. Then weigh it.

Bonus prize for lightest flashlight that also survives the 5 foot drop.

Sample of competition day:

Awards and Presentations

Students that make the top 3 lightest flashlights that survive the 5 foot drop will receive a certificate and reward.

Student feedback from a Survey:

Want to see more of the survey? Check out this video:

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