Enter the wattage rating and the source voltage into the calculator to determine the amperage draw of the appliance.
- Amps to Watts Calculator
- Watts to Amps Calculator
- Watt’s Law Calculator
- Power Loss Calculator
- mAs Calculator
Amps Draw Formula
The following formula is used to calculate an amperage draw amount.
A = WR / SV
- Where A is the amps draw (amps)
- WR is the wattage rating (watts)
- SV is the source voltage
Amps Draw Definition
What are amps draw? An amperage draw is a total current in amps delivered to an appliance or device that is dependent on the source voltage and wattage rating of the device.
How to calculate amps draw?
- First, determine the wattage rating.
For this example, we are looking at a lightbulb with a wattage rating of 200 watts.
- Next, determine the source voltage.
The light bulb is connected to a standard outlet, so the source voltage is 120 volts.
- Finally, calculate the amps draw.
Using the formula, the total current is 200/120 = 1.66 amps.
Are amps drawn or pushed? Amps are always drawn from a source as opposed to being pushed.
What determines amps draw? The number of amps or current that a device or appliance requires is dependent on the source voltage and the maximum power of the device, known as the wattage rating.