Learning Intentions
- To learn how resistors resist the flow of electrical current
- To learn how to calculate the current through a resistor
- To learn how resistors consume electrical power
Media
Gaurav J – TheElectricalGuy – What is Power Rating of a Resistor | Why Power Rating Matters (5:01)
Demonstrations
In the Templeton classroom, we have the following resistors to examine:
- Large power resistor
- Heating element from an oven
- Tiny surface mount 0603 resistor
- Various sizes of through hole resistors
When will it burn?
- A 1/4 Watt through-hole resistor tends to burn (the smoke comes out) when 5 Watts of electrical power pass through it. What voltage should we apply to make the following resistors burn?
- 500 Ω
- 47 Ω
- 4.7 Ω
- Our power supply can only generate 50.0 V DC output. What is the largest value of 1/4 Watt through hole resistor that it could burn?
Notes
Worksheet – Ohm’s Law and Electric Power
Worksheet Solutions
Worksheet – Solving Resistor Circuits
Worksheet Solutions – Solving Resistor Circuits
Worksheet – Voltage and Current Dividers
Worksheet Solutions – Voltage and Current Dividers
Worksheet – Solving Complex Resistor Circuits
Worksheet Solutions – Solving Complex Resistor Circuits
Lab – Resistivity of PlayDoh