best lawn mower electric image
Nicole B
We've got a very small yard of bermuda grass. We're currently shopping for electric lawn mowers, but don't know what an acceptable amount of amps would be? We saw one in our price range with 6.5 amps, but for $40 more, we can get a 9 amp mower. Is there a big difference between the two? Would I need more amps? And is it worth the $40 price difference? Thanks so much!
Answer
With your very small yard you will not need the higher amp model. You need to keep the grass at a reasonable height each time you mow. In other words do not let it get too long before you mow. That is what will cause a strain on the smaller motor. The difference between the two motors you are looking at is very small. The 6.5 amp is approximately 1/2 horsepower and the 9 amp is approximately 3/4 horsepower. So that is very little difference. I think you should save the 40 bucks for something else. This link may help.
http://products.howstuffworks.com/electric-lawn-mower-reviews.htm
With your very small yard you will not need the higher amp model. You need to keep the grass at a reasonable height each time you mow. In other words do not let it get too long before you mow. That is what will cause a strain on the smaller motor. The difference between the two motors you are looking at is very small. The 6.5 amp is approximately 1/2 horsepower and the 9 amp is approximately 3/4 horsepower. So that is very little difference. I think you should save the 40 bucks for something else. This link may help.
http://products.howstuffworks.com/electric-lawn-mower-reviews.htm
Can I use a smaller-gauge extension cord than is recommended for my electric lawn mower?
J.
The owner's manual of my 13-amp electric lawn mower says that if I use a 50-foot extension cord, it must be 16-gauge. If I use a 100-foot extension cord, it must be 14-gauge. And if I use a 150-foot extension cord, it must be 12-gauge.
My question is: Can I use a 100-foot 12-gauge extension cord? Will it be inadequate, or perhaps too adequate?
Answer
Yes, based on the parameters you describe, a 100 foot 12 gauge wire is fine.
Here's why. The issue is the voltage that will be presented to the electric lawn mower itself. The torque produce by the mower motor is proportional to the square of the voltage at the motor terminals. That voltage will be the voltage at the receptacle MINUS the voltage drop in the cable.
Now, the numerical gauge (size) of a wire is inverted - that is, larger conductors have smaller gauge numbers, so a 12 gauge wire is physically larger than a 14 gauge wire, etc. And the resistance in the wire is inversely proportional to wire diameter - so a smaller wire has more resistance. And if the wire has more resistance, then there will be more voltage drop in the wire.
So when the manufacturer tells you that you can use a 150ft 12 gauge extension cord, what he is saying is that the voltage that will be present at the lawn mower end of that cable will be sufficient to produce the torque required to cut grass based on the expected voltage drop in that cable. A 100 ft 12gauge cable will have about 2/3 the voltage drop of a 150 foot cable. So the shorter cable will be fine.
Yes, based on the parameters you describe, a 100 foot 12 gauge wire is fine.
Here's why. The issue is the voltage that will be presented to the electric lawn mower itself. The torque produce by the mower motor is proportional to the square of the voltage at the motor terminals. That voltage will be the voltage at the receptacle MINUS the voltage drop in the cable.
Now, the numerical gauge (size) of a wire is inverted - that is, larger conductors have smaller gauge numbers, so a 12 gauge wire is physically larger than a 14 gauge wire, etc. And the resistance in the wire is inversely proportional to wire diameter - so a smaller wire has more resistance. And if the wire has more resistance, then there will be more voltage drop in the wire.
So when the manufacturer tells you that you can use a 150ft 12 gauge extension cord, what he is saying is that the voltage that will be present at the lawn mower end of that cable will be sufficient to produce the torque required to cut grass based on the expected voltage drop in that cable. A 100 ft 12gauge cable will have about 2/3 the voltage drop of a 150 foot cable. So the shorter cable will be fine.
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