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Circuit symbols
What is electricity?
Electric current is related to the voltage that produces it, and the resistance that opposes it.
Electric current is related to the voltage that produces it, and the resistance that opposes it.
Electric current is the rate of flow of electric charge.
In solid conductors, electrons carry the charge through the circuit because they are free to move throughout the atomic network.
These electrons are called conduction electrons or free electrons.
Protons are bound inside atomic nuclei, locked in fixed positions.
In fluids, such as the electrolyte in a car battery, positive and negative ions as well as electrons may flow.
[Enrichment] What is Electricity?
[Enrichment] What is Electricity?
A more detailed explanation which look at it at the atom level
Introduction to Circuit diagram
Series Circuits
Parallel Circuits
How to wire an ammeter in a circuit to measure the current flowing through a circuit element.
How to wire a voltmeter to measure the potential drop across a circuit element.
There are more resources in the youtube link.
Ohm's law calculator to check your answers.
Simple electric circuit using variable resistance wire on ruler
Experiment on Relationship between Resistance of a Constantan Wire and its Length
Practical 3: Parallel Circuits connection with 1 ammeter
[Photo courtesy of Ms Khadijah]
Practical 3: Parallel Circuits connection with 2 ammeters
[Photo courtesy of Ms Khadijah]
Circuit Analysis - a good summary on how to calculate V, I, R
Circuit Analysis - a good summary on how to calculate V, I, R
HBL 21 Mar 2022
HBL 21 Mar 2022
What is Voltage and potential difference?
What is Voltage and potential difference?
Let us start by revising this.
Examples in our daily lives are shown at the end to explain why we have to be careful when we bring our electrical appliances overseas.
Test Your Skills
Test Your Skills
Problem 1) Lets say we have this lamp which has a resistance of 240 ohms. If we plug this into an outlet in the US, which uses 120V, what will the current be?
Problem 2) If I plugged the same 240 ohm resistor lamp into an outlet in the UK, we get a current of 0.958A, so what is the voltage being applied?
What is Current?
What is Current?
Watch this video for a quick revision on electric current and some of the concepts that we have learned. It ends of with the use of resistance in our daily life. Please watch the whole video.
In Dec 2020, three people who died in a flat in Jurong Lakeside were electrocuted after the cables in the plug supplying power to their instant water heater fused together.
Read the sad news in CNA here.
4 Tips to Avoid Electrocution!
What Happens When You Get Electrocuted?
Electrocution in Water
Electrocution in Water
Please DO NOT try this at home.
This video shows you the danger of beign being electrocuted.
An earth leakage circuit breaker (ELCB) is an electrical switch that can sense current flow or leakage of electricity and trip the main switch in the apartment before any further damage could happen.
[Source]
Videos for Term 2
Videos for Term 2
Energy Use In Electrical Appliances
10 Ways to Save Electricity at Home
GCSE Physics - Plugs and Wires
GCSE Physics - Fuses and Earthing
Singapore's Power Problem: Inside Our Immense Energy Consumption | Climate Change: A Wicked Problem
Singapore's Power Problem: Inside Our Immense Energy Consumption | Climate Change: A Wicked Problem
This is a thought provoking video that we should watch and discuss with friends and our family members.
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