# a12v curcuit connected to 24v PSU what will happen?

Discussion in 'General Electronics Chat' started by MarkSimms, Apr 13, 2016.

1. ### MarkSimms Thread Starter Member

Apr 6, 2016
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if you connect a12v curcuit connected to 24v PSU what will happen? the voltages 12v and 24v could be different, I just want to know what happens ? according to ohms law more voltage less amps , but same resistance, only watts would be the same, it seems like it would work out?

2. ### #12 Expert

Nov 30, 2010
16,704
7,354
According to Ohm's Law, double the voltage = double the current.

3. ### profbuxton Member

Feb 21, 2014
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Formulate a theory about the result, carry out the experiment, write up the result and let us know your observations.

4. ### dl324 Distinguished Member

Mar 30, 2015
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It depends on the circuit.

5. ### blocco a spirale AAC Fanatic!

Jun 18, 2008
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It's very easy to find out what happens when you increase the voltage across a fixed resistive load.

Which version of Ohm's law are you thinking of?

6. ### crutschow Expert

Mar 14, 2008
13,508
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You version of Ohm's law is not the one the rest of us use.

7. ### Willen Member

Nov 13, 2015
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If your load designed to handle 120mA at 12V (1.4 Watts) then the load's resistance is 100 ohms. If you double the supply then law says: 24V/100 ohms = 240mA (5.7 Watts). It's VERY high than needed so the circuits would be fried.

But it depends on circuit, some circuits have been designed with wide supply input voltage, eg- a circuit regulated by 78xx regulator.

Nov 24, 2012
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