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Episode 14 - Resistors
In this episode I explain what resistors are and how we can use them. We will also see the power of resistors, variable resistors, and potentiometers. Don't miss it!
To know the value of the resistor, there are color codes. Just type "resistor value" and you will get a result of color codes.
The calculation that involves VOLTAGE, INTENSITY, and RESISTANCE is the Ohm's law:
Voltage = Intensity * Resistance
- Voltage = expressed in volts.
- Intensity = expressed in amperes.
- Resistance = expressed in ohms.
This means if we have a 9V battery and we want 100mA (0.1A) as resistance in the circuit, we do the calculation:
Resistance = 9V / 0.1 A = 90 ohms
Now to know the power of our resistance, we have the following calculation:
Power = Voltage * Intensity
- Power = expressed in watts.
- Voltage = expressed in volts.
- Intensity = expressed in amperes.
If our voltage is 9V and our current is 0.1A, the minimum power of the resistance must be:
Power = 9V * 0.1A = 0.9 W
Next week's episode, we will see pyrotechnics using resistors!
