Aplogies for the silly question, but I'm having a senior moment and cannot for the life of me think how to do the calculation!
A site 240 volt power supply is listed as 10 amps.
We plug in a 1kw (1000watt) fan heater and have the water heater on, which draws another 1kw (hypothetical). Add two 40 watt lights and two 60 watt heat tubes. So we're using 2200watts (2.2kw)
What percentage of the available power are we using?
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The results are based on a uk supply rated at 230 volts
60 Watts=0.26 Amp
100 Watts=0.43 Amp
200 Watts=0.87 Amp
300 Watts=1.30 Amp
400 Watts=1.74 Amp
500 Watts=2.17 Amp
600 Watts=2.61 Amp
700 Watts=3.04 Amp
800 Watts=3.48 Amp
900 Watts=3.91 Amp
1000 Watts=4.35 Amp
1100 Watts=4.78 Amp
1200 Watts=5.22 Amp
1300 Watts=5.65 Amp
1400 Watts=6.09 Amp
1500 Watts=6.52 Amp
1600 Watts=6.96 Amp
1700 Watts=7.39 Amp
1800 Watts=7.83 Amp
1900 Watts=8.26 Amp
2000 Watts=8.70 Amp
2100 Watts=9.13 Amp
2200 Watts=9.57 Amp
2300 Watts=10.00 Amp
2400 Watts=10.43 Amp
2500 Watts=10.87 Amp
2600 Watts=11.30 Amp
2700 Watts=11.74 Amp
2800 Watts=12.17Amp
2900 Watts=12.61 Amp
3000 Watts=13.04 Amp
3100 Watts=13.48 Amp
3200 Watts=13.91 Amp
3300 Watts=14.35 Amp
3400 Watts=14.78 Amp
3500 Watts=15.22Amp
3600 Watts=15.65 Amp
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Pete.
It looks like your 2.2kw of power is your limit on a 10 amp supply and it would be best to keep it a little lower than that if possible as a safety margin.
Re the amount of electricity used by the original poster - don't forget electricity is used for the light in the fridge, the electric kettle, the water pump, the toilet flush, the ignition on the cooker, charging small electrical items and lots of other random things. It is never worth using the maximum amount available!
And don't forget that on some very crowded continental sites the voltage may well drop to, say, 220 volts which will increase the amperage taken slightly.
DaveS1
Quote: Originally posted by DaveS1 on 31/1/2016
And don't forget that on some very crowded continental sites the voltage may well drop to, say, 220 volts which will increase the amperage taken slightly.
DaveS1
Actually the exact opposte applies,the lower the voltage the lower the Amps.
saxo1
Your teacher was correct as far as that equation is concerned but it is the wrong equation.
Ohms law:
I = V / R (Current = Voltage Divided by Resistance)
To determune the Current you need to know the resistance and the voltage.
saxo1
I remember the triangle formula. Give to us in a second year physics lesson. I still visualise it when I want work out current.
But really if I want work it out quickly then knowing that Watts divided by volts gives the number of amps. Then dividing the number watts by 250 gives an approximate answer which in reality should be close enough so 1kW equals 4 amps. If you want it even closer then add 10% to the amps. 1kW equals 4.4 amps The correct answer is 1000/230 is 4.35 amps but I think 4.4 is close enough.
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Topic: 10 amp site supply, how many watts
