Measure Meter

can we measure the consumption of power of a particular appliance by clamp meter ?
can we measure the consumption of power of a particular appliance by clamp meter ?
because as far as i know we can calculate the load by the clamp meter of any particular appliance, so by using power & power energy calculations we can easily find out the energy consumption of that appliance, is this true ?
where we apply or clamp the clamp meter on a particular appliance or device ?
thanks
do we need to strip off the hot wire (live wire) or can we clamp the clamp meter on the insulation of the hot wire (live wire) ?
how do we get to know that which one is the hot wire (live wire) ?
clamp meters measure the current.Since we know the voltage, we can cal;culate the power.
By using the formula root3xvxIxcos Theta.
Vvoltage
I current
cos Theta power factor
Root three for three phase
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Multi-meter to measure amps


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