An alarm clock draws 0.5 A of current when connected to a 120 volt circuit. Calculate its resistance. Resistance: 20Ω. A subwoofer needs a household voltage of 110 V to push a current of 5.5 A through the wire coil. What is the resistance of the subwoofer? Resistance: 150Ω. A walkman uses a standard 1.5V battery.
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To calculate charging time using this formula, you simply divide battery capacity by charging current. 100Ah ÷ 10A = 10 hrs. In this scenario, your estimated charge time is 10 hours. Tip: You can estimate how much battery capacity you need by using the inverse of this formula: amps × hours = amp hours.

According to the chart above, the power discharge for a 1.5 V "D"battery at approximately 210 hours is 0.1 Watts (W). At about 60 hours the power discharge is 0.25 W. At about 40 hours the power discharge is 0.5 W. At about 10 hours the power discharge is 1.0 W. More power is possible when the battery is in service for less time.

To extend the life of the battery. We should charge with a constant current and have a value of 0.1 of the battery's maxed capacity or called 0.1C. Practical example: 1.2-volt 700mAh AA Ni-MH rechargeable battery, we should charge it with a current of 700mA x 0.1 = 70mA for about 10 to 16 hours.

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how to charge 1.5 volt battery