Electricity experiments tutorial

Experiments on the topic of experiments can be tricky because there are just a lot of variables that can affect the brightness of bulbs.

I’ve made 3 videos for this. Results are not shown in the earlier part of the video, so students will still have to carry out the experiment to record the results.

Effect of number of bulbs, arranged in series, on brightness of the bulbs.

Effect of number of batteries, arranged in series, on brightness of the bulbs.

Effect of number of bulbs, arranged in parallel, on brightness of the bulbs.

Steady hand game

Currently doing electricity with Sec 3 NT and here’s throwback of a bonus activity I did with them last year for the chapter on Electricity. Each pair received a kit of battery, chopstick, straw, lightbulb, wire and index card to make their own steady hand game.

The video shows my first prototype đź‘Ź

It was not that difficult. They managed to get it done within 1hr lesson.

They designed their own loop and had fun challenging each other. A player is out if the bulb lights up.

Flying water rocket


Helped out for Aviation workshop by GUILD. The kids made paper aeroplane, kite and launched their own water rocket.

ac4708c8f3f70d181f6ae0d635541b98Made kite using newspaper.

Pretty amazing how the kids simply took over the whole activity on their own after they kinda get how to launch the water rocket. The kids were initially shy and quiet when they started the workshop. But soon, they warmed up, got excited with the stuff we were doing and they were definitely enjoying themselves.

Heat demonstration

Kids were amazed with convection demonstration today.

They went “wow” when they saw the red dye reversed its direction. Love their expression! If only I could snap a photo of their wide-eyed reaction. hahaa.. This is why I enjoy doing demonstration 🙂

The kids also had fun with a “magic liquid”.

They kept asking me where to buy it and I was like… I don’t even know what this “toy” is called to google to buy it.

Also did metal ball and metal ring, but not much excitement as these two demo.

Teaching of density using case study.

One of my favourite lesson package to carry out for lesson on density is “Gold Ingot Scam”. It’s in the form of a case study in which students role-play as police officers. This is based on a real crime in Singapore in 2011.

I like this activity because there are videos from Crimewatch that can be used for pre and post lesson. In fact, in the part 2 of the video, it shows the detective carrying out the experiment.

I did this as a group work with my students.

Each group receive an electronic balance, a pendulum bob wrapped with Ferero Roche gold foil and a measuring cylinder.

The pendulum bob is kinda tricky though. The small one will not show much increase in water level, but the medium bob might get stuck in the cylinder. They kinda vary slightly in size, so you have to check beforehand. I was blessed with a lab tech who was willing to check that the medium bobs used did not get stuck in the cylinder. Luckily it was only 10 sets needed for him to check *phew*

I provided for the students a mock police report and a template for them to complete their report.

I did not provide instructions as I wanted the students to figure out on their own. Most generally got it that they have to measure mass and volume. But, while they’re were carrying out the experiment, I did spot some mistakes though.. such as

  1. Measuring volume, then mass (with water droplets still on sample!!)
  2. Not releasing the sample completely in the measuring cylinder. Some held on to the string, with the sample in the middle of the cylinder filled with water.

In the next lesson, I discussed these with them and elicit response from them on how those steps can affect the results.

For those keen for the lesson materials, you can get the materials here.

Simple Machines

3NT kiddos learnt about simple machines in Term 3. Created station-based learning activity for lesson. Each station focus on a key learning point.


They had made their own toy car in previous lesson. At this station, the kids compare the force needed to move 50g weight in a carton with wheels and without wheels.


Here, the kids adjust the slope of the box to compare the force needed to move the weight as the steepness of ramp change.


Another comparison type of station. Comparing force needed to move a weight across sandpaper and concrete floor.



The last one is their favourite! They make their own pulley and fasten a magnet on one end of the string. Then they adjust the pulley to pick-up as many paper clips on the table top. Kids do enjoy games and challenging each other, so they love this station the most!

Sources of light

To introduce to students that light is a form of energy, I usually highlight some examples of energy changes to light energy.

Here are some stuff I use for to demonstrate the energy conversion…


Different sources of light energy

Dynamo torch (bought on Carousell):
Kinetic energy to to electrical energy to light energy light energy

Solar chasing light (bought in Kmart, Australia):
Solar energy to electrical energy to light energy

Light bulb:
Chemical energy to electrical energy to light energy

Chemical energy to electrical energy to light energy