How to Measure Current Flow
Current flow is a term used to describe the action of electrical current. When there is current flow, an electrical device is consuming electrical power, which is a product of voltage and current. There is no current flow unless there is an electric potential, or voltage, between the input lines to the electrical device. For a typical household electric device, this voltage is derived from outlet plugs that supply 120 volts. When a device is plugged in and turned on, current flows through the power cord. This current flow can be measured with a clamp meter.
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Instructions
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Turn on the clamp meter and set the function for measuring current. There will also be a selection knob or button to select whether you’re measuring alternating current (AC) or direct current (DC) flow. Most household electric devices use household voltage from an outlet, which will be AC current.
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Clamp the meter onto the power cord. The ends of the clamp meter arms, which resemble pincers, will have a recessed area through which the power cord should be placed. Ensure that the clamp meter arms are stable with the cord between them.
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Read the current flow on the clamp meter display. Most clamp meters have automatic range finders, but if yours does not, increase the range of the meter until you get a reading. Write down the reading, which will be numbers that represent the amount of amperes, or amps, flowing through the cable.
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Measure the amount of current flow through an appliance such as a washing machine by turning the appliance on and having it perform its functions. The current flow will be much higher when the washing machine motor is turning. The same applies for a dishwasher. For a refrigerator, turn down the thermostat to turn on the cooling action, which will increase current flow.
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Adjust the position of the clamp meter to ensure you’re getting accurate current flow readings.
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Remove the clamp meter from the power cord.
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Tips & Warnings
Make sure you know where the decimal point is on the clamp meter display so you don't make an error in taking a current flow reading.
Electricity is dangerous and can cause electrical shock. Use caution when working with electricity.
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Comments
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lowredrt
Aug 28, 2010
If you are measuring current, you need to split the line. If you clamp around both the hot and common/neutral the two readings will cancel each other out. You need to get an AC Line Splitter to get a reading that is even remotely accurate. You can also split the power cord if its feasible.
