电量计算器
瓦特、kW和马力发电——加上能源使用和运行成本。
输入结果时更新 。
关于此计算器
Electrical power is the rate at which a device converts electrical energy, measured in watts. For a DC or purely resistive load it is simply voltage times current, P = V × I. For an AC load with a power factor below 1 — motors, transformers and other inductive loads — the real power that does useful work is P = V × I × PF, while the product V × I alone gives the larger apparent power in volt-amperes. This calculator reports the power in watts, kilowatts and mechanical horsepower, using 1 hp = 745.7 W.
As a worked example, a device on a 120 V circuit drawing 10 A at unity power factor uses P = 120 × 10 = 1,200 W, which is 1.2 kW or about 1.61 hp. If instead it were a motor with a 0.8 power factor, the real power would fall to 120 × 10 × 0.8 = 960 W even though it still draws the same 10 A. Divide watts by 745.7 to convert to horsepower, or by 1,000 to get kilowatts.
The advanced usage fields turn power into running cost. Daily energy in kilowatt-hours is the power in kW multiplied by the hours used per day; multiply by your price per kWh for the daily cost and by 30 for a monthly estimate. A 1.2 kW load run 4 hours a day uses 4.8 kWh daily, about 144 kWh a month, which at $0.15/kWh is roughly $21.60 a month — the kind of figure that helps compare appliances, size a generator or budget a workshop.
经常问到的问题
电源公式是什么?
瓦特的实际功率是 P = V × I × PF。对于DC 或 抵抗负荷来说, 功率系数是 1, 所以电量只是电压时值的时值。
马力有多少瓦?
一台机械马力等于745.7瓦,1492瓦的重量约为2小时。 平差瓦乘以745.7,转换。
运作成本是如何算出来的?
每日能量是每天x小时的电量,千瓦。乘以30天,每千瓦的价格乘以30天,以估算月成本。
是什么是权力因素,什么时候我改变它?
电源系数是真正起作用的表面电源(V x I)的分数。 它对于DC和耐力负荷(如加热器和白光灯泡)来说是1分,但对于发动机和许多电子设备来说,它下降到了0.7-0.9左右,减少了实际瓦特。
瓦特和伏特安培之间有什么区别?
Watts 是实际功率( V × I × PF); 伏特比值是明显功率( V × I), 没有电因因素校正。 对于阻力负荷来说,它们相等,但对于反应负荷来说,VA等级较高,这就是为什么VA给出发电机和UPS等级的原因。
我该如何把瓦特变成马力?
瓦特除以 745.7. 。 因此, 1,200 W 大约是1.61 hp, 1 hp 发动机大约抽取746 W 机械等效电(在包括效率损失后,再加电)。
API - 使用代码中的计算器
将此计算器称为自由 JSON 端点 。 不需要按键 。 将字段值发送到下面作为查询参数或 JSON 。 任何您省略的, 都会使用相同的默认值, 此页面预填的默认值是预填的; 未知参数是 400, 而不是静音零 。 读取 API 全部文件 →
终点
GET https://calculator.free/api/v1/electrical-power/curl
curl "https://calculator.free/api/v1/electrical-power/?voltage=120¤t=10"JavaScript fetch()
const r = await fetch(
"https://calculator.free/api/v1/electrical-power/?" + new URLSearchParams({
"voltage": "120",
"current": "10"
}));
const data = await r.json();
console.log(data.results);成果仅是一般指导的估计数,而不是财务、医疗或税务咨询。