Contents
How do you decide what resistor to use?
Resistor selection requires three steps:
- Determine the resistance and the watts to be dissipated by the resistor.
- Determine the proper “Watt Size” (physical size) as controlled by watts, volts, permissible temperatures, mounting conditions and circuit conditions.
Can you use a higher value resistor?
The cases where using a higher value resistor will damage a circuit exist, but are a bit less usual than the cases where it may simply produce a weaker result than desired, or a different frequency response than desired.
How to calculate what resistor a led requires?
To calculate the resistor needed for a simple LED circuit, simply take the voltage drop away from the source voltage then apply Ohm’s Law. In other words… R is the resistance, measured in Ohms (Ω).
Do I need to use a resistor?
Introduction to Resistors Current Limiting: As seen above, resistors can be used to limit the current that flows into a device. Voltage dividers: This makes use of two resistors to divide a voltage by the ratio of their resistances. Current shunts: These are low value resistors that are used to measure currents without interfering much with the circuit under test.
How do you calculate current through a resistor?
Calculating the current through a resistor is one of the first elements learnt in basic circuit analysis. Ohm’s Law states that the current is equal to the voltage divided by the resistance. So the current through any resistor can be found by dividing the voltage across that resistor by its resistance.
What are examples of a resistor?
Laptop charger. Mobile phone charger. Fan Speed Controller [Potentiometer] All of us are familiar with the rotating knob that is used for controlling the fan speed. Lightning bulb (Carbon / Metal film) The electronics circuits in CFL, LED and other lightning lamps contain resistors.