Robotics Presentation

Electronics

Lesson 2

Resistors

START

SECTION 01

Recap: Ohms law and resistance

SECTION 01

What happens when...

1. There is not enough resistance in a circuit
2. Current flows through components in that circuit

SECTION 01

Ohm's Law

SECTION 01

Ohm's law

What units do we measure each of these in?

• Voltage: Volts (V)
• Current: Amps (A)
• Resistance: Ohms (Ω)

+ Questions

If you have a resistance of 3Ω, calculate the current for the voltage values below

If you have a resistance of 3Ω, calculate the current for the voltage values below

Double the voltage

Double the current

If you have a voltage of 6V, calculate the current for the resistance values below

If you have a voltage of 6V, calculate the current for the resistance values below

Halve the current

Double the resistance

SECTION 02

Types of resistor

SECTION 02

Research

Research different types of resistors. Key points to look up:

• Name of resistor
• How it functions
• What is the symbol
• Common applications

Create a table of your answers.

Will one type of resistor work for every circuit?

What about this resistor tells us the amount of resistance it provides?

Resistor bands

What does each one mean?

"1st" column

Multiplier

"2nd" column

Tolerance

x 1 Ω

+/- 2%

What did you notice about the units of ohms?

One kiloohm is equal to 1,000 ohms

1 kΩ = 1,000 Ω

One megaohm is equal to 1,000,000 ohms

1 MΩ = 1,000,000 Ω

The same applies for amps: 1 kA = 1,000 A and 1 MA = 1,000,000 A

See how quickly you can complete the conversion game

SECTION 02

Activity

Match the resistors to the correct value

What is the current?

What is the voltage?

What is the Resistance?