Pulley questions and answers
For example, if you have a 100mW (0.1 watt) 5mm white LED, and assume that each AA alkaline battery can supply 1 watt*hour (approximately 0.1 amp for 10 hours = 1v*0.1a*10h=1Watt*Hour)... Then 2 batteries * 1 Watt*Hour / 0.1 Watt = 20 hours If you can use less light, for example 50 mWatt, then the batteries will last about 2x longer.
The combination of current and voltage is the power (watts = volts x amps) of the battery. Battery sizes. Batteries come in many different shapes, sizes and voltages. AA, AAA, C, and D cells, including alkaline batteries, are of standard sizes and shapes, and have about 1.5 volts. The voltage of a cell depends on the chemicals used.
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Mar 13, 2018 · For their AA battery, it looks to have a capacity of 2800 milliamps hours, or 4.2 watt-hours. 9-Volt Batteries The voltage on the industry standard 9-volt battery is, obviously, 9 volts.
Feb 01, 2003 · no,no no the square batteries contain 3 1.5 volt elements in series, but each element can provide a current highter than a AA battery, thats why i reffer to this type of battery. and connecting the batteries in paralel is not recommended beacuse they damidge bacause even new batteries, one is cahrged more than another, so current passes from one to another so you need to connect them with a diode.
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