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Resister Wattage
Posted: 22 Jan 2012, 21:08
by greaserrock
Hi,
I am trying to build the hemmo/christian’s ultra simple bazz fuss circuit as suggested by Beavis Audio as a starter project. It asks for a 10k 1/4watt resister. On a whim I had previously bought some 10k 1/2 watt resisters. Can I use the 1/2 watt resisters? Are they like capacitors in that a higher amount than recommended is ok but a lower amount is not?
Re: Resister Wattage
Posted: 22 Jan 2012, 21:50
by TubeDude22
Yes, it is safe to use 1/2 watt in place of 1/4 watt resistors in the circuit.
Re: Resister Wattage
Posted: 23 Jan 2012, 00:04
by greaserrock
Thank you! Much appreciated TubeDude22.
Re: Resister Wattage
Posted: 11 Feb 2012, 01:48
by digitalzombie
What's the difference between using a 1/4 watt and a 1/2 watt?
Re: Resister Wattage
Posted: 11 Feb 2012, 15:23
by PokeyPete
digitalzombie wrote:What's the difference between using a 1/4 watt and a 1/2 watt?
1/2 watt resistors are bigger, usually!
Actually, a circuit board designed for 1/8 watt or 1/4 watt resistors may not have room for a 1/2 watt resistor.
But to better answer your question.....if current is flowing through a resistor, then there is a voltage drop across
the resistor. That voltage drop multiplied by the current flowing through the resistor gives the wattage needed
by the resistor. The power in watts is given by the formula P=IE....P in watts, I in amps, E in volts.
For example if you used the formula to calculate the power rating of a particular resistor and found that it needed
to be .450 watts.....this would require at least a 1/2 watt resistor (probably really a 1 watt would be better). If
you used a 1/4 watt resistor instead, it would probably explode soon after power up!