Get to Know Ohm's Law: Current, Voltage, and Resistance
Get to Know Ohm's Law: Current, Voltage, and Resistance
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Get to Know Ohm's Law: Current, Voltage, and Resistance
What do you already know about electric circuits?
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Learning Objective
At the end of the lesson you will be able to explain how electric current depends on voltage and resistance, and use Ohm's Law to solve simple problems.
What Do You Know?
What do you already know about electric circuits? Share your ideas with a partner.
Key Parts of a Circuit
Circuits include a source (like a battery), wires, and devices (like bulbs or buzzers). Current flows through the circuit when it is closed.
What is Electric Current?
Electric current is the flow of electric charge. It moves from the positive to the negative terminal through the whole circuit.
What is Voltage?
Voltage is like electric 'push.' It is the energy per charge given by the battery. A higher voltage makes the current stronger.
What is Resistance?
Resistance slows down electric current. It is measured in ohms (Ω). Thin wires or resistors have more resistance.
Meet Ohm's Law
Ohm’s Law links voltage (V), current (I), and resistance (R): V = I × R. You can use a triangle to remember it!
Using Ohm's Law
If you know any two of voltage, current, and resistance, you can find the third using Ohm's Law formula.
Interactive Task: Match the Parts
Look at a diagram of a simple circuit. Drag labels (current, voltage, resistance) to the correct places.
Try Ohm's Law Problems!
If a circuit has a voltage of 6V and resistance of 3Ω, what is the current? Use the triangle to help you.
Animation: Watch Ohm’s Law in Action
Let’s Reflect
How does changing voltage or resistance affect current? Share your ideas with the class.
Write down 3 things you learned in this lesson.
Write down 2 things you want to know more about.
Ask 1 question about something you haven't quite understood yet.
