How do you calculate a dummy load?
How to calculate suitable dummy load for a power-supply?
- 12V×8A=96W so I guess it should be good for about 80-85W.
- 10W=I2×10Ω
- I=√1WΩ=1A.
- V=I×R.
- 12V=I×10Ω
- I=12V10Ω=1.2A.
- P=I2×R=(1.2A)2×10Ω=14.4W, or about 44% overload.
What is dummy load resistor?
A dummy load is a pure resistor of value 50 ohms which can replace your transmitting aerial and enable you to operate the transmitter for test purposes without radiating a signal. A pure resistance is a device which has resistance but no reactance.
What is resistor load?
At the most basic level, load resistance is the cumulative resistance of a circuit, as seen by the voltage, current, or power source driving that circuit. A load resistor is a resistor that has the sole function of increasing the load resistance of the circuit to a specific level.
What is an RF dummy load?
Editorial Team – everything RF A Dummy Load is a device used to simulate an electrical load during testing. In an RF System a dummy load is used to simulate an antenna. By using a dummy load instead of an actual antenna, the transceiver can be tested and configured without radiating radio waves.
What is the value of a dummy load?
A dummy load is a pure resistor of value 50 ohms which can replace your transmitting aerial and enable you to operate the transmitter for test purposes without radiating a signal. It sounds simple enough, but there are two main problems.
Is it possible to make a 100 W resistor?
It sounds simple enough, but there are two main problems. Firstly, it is impossible to delve into your junk box and emerge with a resistor that will dissipate 100 W PEP and still retain its marked resistance value.
How big do.5 ohm resistors have to be?
The .5 ohm resistors must also be big, like 50 watts each, and care taken to cool them. If you like, you can reduce the value of the emitter resistors to cut their dissipation, but then the control voltage supplied by the pot becomes more sensitive, and the total dissipation of the transistors increases.
What kind of resistor do I need for 28V supply?
A simple circuit is all that is needed. Example: 28v supply for a load of 30 amps needs only a .93K resistor with a lamp in parallel, and in series with a normally open contact switch. When the switch is closed you should have instant brightness of the lamp or if you prefer use a amp meter in series with the resistor.