AC to DC to conserve energy, good idea or bad?

Meowth · Guest

Will I conserve more energy by using a 120v AC 60watt reading lamp, or
a lamp that has a built in transformer that has an input of 120v AC to
12v AC which uses a 12v 60watt bulb?

absorbentgnome · Joined: 30 May 2005 Posts: 51 Location: Cardiff, UK

The 120V AC bulb will be more 'efficient' because it is directly connected to the power source. The 12V AC bulb requires the use of a transformer, which will waste some energy as heat.
The difference, however, is minimal. You'd be far better off using an energy saving fluorescent bulb/tube if you are worried about saving energy.

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absorbentgnome · Joined: 30 May 2005 Posts: 51 Location: Cardiff, UK

Guest · Posted: Tue Jul 26, 2005 3:56 am Post subject:

Guest

current=watts/volts.
The lower the voltage the higher the current.
120v better as a result.