Is 10amps better than 5amps

Answer 1

Yes ... and ... no. 10 amps will sustain a greater load, but if the device being powered only requires a maximum of 5 amps, and there is a short in the wiring, the circuit breaker will trip. If the same device is on the 10 amp circuit, the device being powered may sustain additional damage and even catch fire or explode.

Use only what is needed in Home Electricity. In every case "more" isn't better.

Answer 2

Amperage draw is governed by what the device needs to operate. The only time that a device will draw more than what the equipment's nameplate reads is when it is used beyond its manufacturing specification.

If you are referring to hand tools of the same voltage rating then the amperage rating will be higher as the horsepower of the tool increases. If the price of the lower and the higher amperage tools are relatively close together, then the choice of the tool with the higher amperage rating is the better buy. Having the extra power in a hand tool is much less likely to overload itself when you really bare down using it on an extra heavy work load.

As a note; normal electrical loads will not catch fire or explode. The breaker that feeds the electrical circuit is sized to protect the conductor that the load connects to. The breaker will trip long before enough heat is generated by the fault to ignite adjacent combustible materials.