A #8 copper conductor with an insulation factor of 60 degrees C is rated at 40 amps. For a built in safety factor, a #8 conductor with an insulation factor of 75 or 90 degrees C has a rating of 45 amps.
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No. The two appliances usually have dedicated circuits. The range will have a two pole 40 amp breaker and be fed with a 3-C #8 copper cable. The dryer will have a 30 amp two pole breaker and be fed with a 3-C # 10 copper cable. As you can see by powering a 40 amp device from a 30 amp breaker, full operation of the range will trip the 30 amp breaker.
No, it is not recommended to replace a 35 amp breaker with a 40 amp breaker for an AC unit. Breakers are designed to protect the circuit and the equipment, so using a higher rated breaker can lead to overheating and potential damage. It is best to use the correct amperage rated breaker for the equipment.
No, it is not okay to replace a 20 amp breaker with a 40 amp breaker. Breakers are designed to protect the electrical wiring in your home, and using a higher amp breaker can overload the circuit and create a fire hazard. Always use the correct amperage breaker for the circuit.
The formula you are looking for is I = W/E.
No, because if you switch a 50-amp load on, it will blow a 40-amp circuit breaker if the load exceeds 40 amps, which is likely.