just want to know for a project =)
2007-11-09 04:45:25 · 5 answers · asked by Anonymous in Environment ➔ Green Living
A modern hand held calculator with a LCD display uses so little power that I am tempted to call it essentially zero. It can run for months on the smallest battery. Even at only 1 Watt, that small battery would be drained dead in less than one hour, so the calculator must be using much less than 1/1000 of a Watt.
2007-11-09 06:18:34 · answer #1 · answered by campbelp2002 7 · 1⤊ 0⤋
You should be very suspicious of people who are answering this question in units of watts (or no units at all), as watts are a unit of power, not energy. Power is the time derivative of energy.
You asked, "how much energy does a calculator use?" The answer is the power consumption (watts) of the calculator times its duration of use. For example, my scientific calculator is rated at 200 microwatts (0.0002 watts). If I use it for one second, it will consume 200 microjoules (0.0002 joules) of energy. That is a vanishingly small amount of energy. If that energy were obtained via the electric mains rather than from a battery, the calculator could be run for approximately 38 years on US$0.01 worth of electricity. As another illustration, the amount of energy needed to run a 100-watt light bulb for one second would run my calculator for almost 139 hours.
2007-11-09 11:35:44 · answer #2 · answered by Rationality Personified 5 · 0⤊ 0⤋
It depends on the calculator. Check the back of it or in the battery compartment.
2007-11-09 05:08:32 · answer #3 · answered by enicolls25 3 · 1⤊ 0⤋
The power is in milli watts, naturally energy requirment will be in milli watt hours
2007-11-09 06:20:30 · answer #4 · answered by Pradeep 1 · 1⤊ 0⤋
Mine is solar powered, so I'm guessing not much.
2007-11-09 07:19:10 · answer #5 · answered by Anonymous · 0⤊ 0⤋