Chapter 13

Electrical Systems

Success Criteria - Chap 13.pdf

Circuit Diagram Symbols

Tip: Be familiar with the symbols and drawing of circuit diagrams

Rheostat / Variable Resistor

- xmphysics

Think:

How does it work, and how do we connect it properly?

Have fun with the virtual circuit construction kit:

Cartoon Analogy

Think: Using this cartoon, can you define the properties that each character represent?

Water Analogy

Think: Using the images below, can you explain what is meant by voltage, current (amperage) and resistance?

Visualising Current & Voltage (Series VS Parallel)

- Eugene Khutoryansky

Think:

1. Why is voltage also known as 'potential difference'?

2. As voltage across a bulb increases, what happens to the current & brightness?

3. In a parallel circuit, how does the voltage across each bulb compares to the total voltage produced by the battery? What about current?

4. In a series circuit, how does the voltage across each bulb compares to the total voltage produced by the battery? What about current?

Visualising Resistance (Series VS Parallel)

- Eugene Khutoryansky

Think:

1. What are the 3 ways to increase current flowing through a circuit?

2. What happens to the total resistance as you connect more resistors in parallel?

3. What happens to the total resistance as you connect more resistors in series?

4. How is current, voltage and resistance related to one another? (Hint: what is the formula, also known as 'Ohm's Law'?)

Heating Effect of Electric Current

- Into the Ordinary

Think: How do electric kettles work?

Chemical Effect of Electric Current

- FuseSchool

Think: What is 'electrolysis'?

Magnetic Effect of Electric Current

- Jared Owen

Think: How is the magnetic effect useful in an electric motor?

Electromagnetic Bell Simulation

Click "Play" to watch the animation

Electrical Appliances:

Calculating Cost

- Step by Step Science

Tip:

Step 1 - Convert W to kW

Step 2 - Calculate the no. of kWh

Step 3 - Calculate the cost

Electrical Appliances:

What is a Fuse?

- Don't Memorise

Think:

How does the fuse help prevent electric fire?

Refer to the textbook to also learn about the 'Minature Circuit Breaker'

Electrical Appliances:

Conserving Energy

- CleanGreenSingapore

Challenge:

List as many ways we can save energy at home!

Sketchnote - Topical Summary:

Extend Your Learning

(Not in Syllabus)

Summary of Circuit Calculations

- CrashCourse

Watch this video in 2 segments:

0 to 4 mins (Difficulty: Normal)

You should aim to understand and master the calculations shown
Recall the formula for calculating resistance in series VS resistance in parallel
Use the video to work through each step
(Pause, slow down, or replay certain sections whenever you need to)
Strategy - If there are multiple resistors in series (or parallel), it is easier to calculate by visualising them as one "combined" resistor

4 to 8 mins (Difficulty: Advanced)

For the exams, it is sufficient if you understood the first segment
You may challenge yourself with the more complicated calculations here, but remember, the formula and rules used are the same

Sketchnotes on Circuit Calculations

You can challenge yourself by trying to understand how the formula for resistance is derived (see the 'proof' below).

Visualising Energy & Power

- Eugene Khutoryansky

Think:

1. Can you visualise how chemical energy in a battery is converted to electrical energy, then light energy?

2. What is the advantage of connecting more batteries in parallel? (Hint: how does it affect battery life?)

3. What is the advantage of connecting more batteries in series? (Hint: how does it affect brightness?)

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