how much power is dissipated by the battery?
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First, we use Ohm's law ( V = I × R ), to find the current through the resistor. The voltage across the resistor is V = 9 V. The resistance of the resistor is R = 100 ?. Then, we can use the power rule ( P = I × V ), to find the power dissipated by the resistor.
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Now we're getting somewhere! On average, at any given moment, your brain's electricity is outputting roughly 0.085 Watts of power. Your brain is basically an energy saving LED.
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That will vary, depending on the state-of-charge of the battery when you go to charge it. But as a guide, Tesla batteries range from about 65 kWh to 100 kWh. To fully charge a dead-flat 100 kWh battery will take 100 kWh's of electricity (100 units on your utility bill).
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If you have a corded electric mower, then it will typically use between 700 and 1800 watts of electricity per hour. Cordless electric mowers, on the other hand, tend to be a bit weaker. Battery sizes are often between 40 and 90 volts, requiring 600 to 1400 watts of electricity to charge, depending on battery amps.
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In any case, laptop chargers all have a maximum wattage (power) they can output at any point in time, and it usually hovers around the 60–90W. However, what your laptop consumes will (usually) be much lower than that depending on several factors. Notably: If the internal battery is also charging.
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Once it's fully charged, the on-screen battery strength meter on most models provides a usable estimate of your remaining power. If you're charging from USB instead, the available current is much lower than it is with the standard chargers. Rather than four hours, a full charge might take as long as eight to 12 hours.
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The basic Glade Plug-in uses 2.1 watts of energy. The fancier ones with nightlights and light shows use over 3.5w.
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Many Appliances Use Just as Much Power When Off Always leaving a laptop computer plugged in, even when it's fully charged, can use a similar quantity — 4.5 kilowatt-hours of electricity in a week, or about 235 kilowatt-hours a year.
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['This is where you can find information on battery status.', "The remaining power available and your battery's life is also displayed here."]
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Power Inverter, 150 Watts. Plugs into the 12-volt lighter socket in your vehicle or boat. Coverts battery power into household AC power. Operate up to a 13" TV-VCR, camcorders, radios,musical instruments and satelitte equipment computers and other tools and DC appliances in your vehicle.
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In our tests, both iPhones and Android smartphones used significantly less battery power with battery-saver mode enabled—as much as 54 percent, depending on the phone we used. While both airplane mode and low-power mode conserve battery life, they do so at a heavy price.
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Far from anything worth being sheepish over, 1 kwh costs about 12 cents. To be specific, your iPhone battery holds a charge of 1,440 mAh, or about 5.45 watt hours.
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The rating 2600mAh (or 2.6Ah) means the battery will produce 2600mA for one hour, or 1000mA for 2.6 hours of indeed 1mA for 2600 hours.
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The Volt has a 18.4 KWH battery. Assuming a 80% charging efficiency it would take 23 KWH to charge it completely.
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The power and longevity of a battery is noted by its Amp Hour (Ah) rating. Basically, this denotes how long a battery will last if it isn't recharged. For example if a battery is rated as, say 8Ah, it will be able to provide 4 amps for 2 hours. If a battery is rated as 100Ah, it will produce 100 Amps for 1 hour.
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Cell Phones use approximately 2 to 6 watts when charging, while a charger left plugged in without a phone will consume 0.1 to 0.5 of a watt.
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A laptop uses about half the amount of electricity as a desktop, about 32.3 watts. When in standby mode, a laptop uses very little electricity- around 1.6 watts to be exact.