Electricty runs in a loop from neg to pos (in DC). From your question, it appears you're talking about AC. If it is single-phase, it still runs in a loop, so it *SEEMS* from your description that it would not be additive.
Best to draw a diagram of what you're measuring when you say "measured amps on both legs" and resubmit the question before I give you a 100% answer.
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Yes, the measured amps on both legs of a 240 volt circuit are additive. For example, if one leg is using 10 amps and the other leg is using 5 amps, the total amperage drawn from the circuit will be 15 amps.
Amps (A) measure electrical current flow, while volt-amps (VA) measure apparent power in an electrical circuit, which is the combination of both real power (measured in watts) and reactive power. Essentially, amps refer to current, while volt-amps refer to total power.
While Amps and Volts are both units of electrity, they are quite independant. Total electrical energy is measured in "watts". Amps * Volts = Watts. You can get 100 Watts with 10 Volts @ 10 Amps. You can get 100 Watts with 100 Volts @ 1 Amp. You can get 100 Watts with 1,000 Volts at 0.1 Amp. It's like asking, "How do you get water flow of 20 gallons per minute?" You COULD have a 3 ft diameter pipe with very low pressure, or you COULD have a 1/2 inch pipe with very HIGH pressure. Both could give you the desired 20 gallons per minute.
Single pole refers to a circuit breaker that interrupts the current flow of one hot wire, while double pole interrupts the current flow of two hot wires simultaneously. In a 240-volt circuit, a double-pole breaker is used to control both the hot wires, providing higher safety protection as both sides of the circuit are disconnected.
There is no rating for #14 wire in the electrical code book. This is because #12 aluminium wire is rated at 20 amps and that is the minimum of home wiring circuit wiring in aluminium. It is not, if at all, used anymore. #10 at 75 or 90 degree C is rated both at 30 amps. #8 at 75 or 90 degree C is rated both at 45 amps.
A 120 v circuit would supply 120 v to both resistors if they are in parallel, which is 120/100 amps into a 100 ohm load, and 120/80 amps into am 80 ohms load, which totals up to 2.7 amps, so the total power is 120x2.7 watts or 324 watts.