General Question

Roby's avatar

On battery operated radios: If you turn the volume up, does that pull more juice from the batteries?

Asked by Roby (2939points) January 11th, 2011

This was a question on another site…no one knows the answer..yet anyway.

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4 Answers

jaytkay's avatar

Absolutely. You can’t increase the volume without using more energy.

Small radios don’‘t take a lot of power though. I have a shower radio with three C cells. I use it 30 to 60 minutes a day, and the batteries last 6 months or more.

PhiNotPi's avatar

Yes, and here is why-
A conventional speaker creates sound by vibrating a membrane. The membrane is pulled by a magnet on the back. The magnet is surrounded by a wire coil. When the current through the coil changes, the magnetism generated by the coil pulls the magnet and the membrane. The larger the change, the louder the sound. To generate large variations, you need more current. This current comes from the battery.

Not_the_CIA's avatar

@PhiNotPi – Saved me a lot of typing. and used less profanity

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