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maks197457 [2]
3 years ago
12

An electrician must decide between 3 heaters. The wire that she is using is rated 15A maximum, anything beyond that is a fire ha

zard. Two of the heaters operate off a standard 120V circuit. One is rated 900W and the other 1800W. The third operates off a 240V circuit and can deliver 3000W of power. Calculate the amount of current for each.
Physics
1 answer:
lutik1710 [3]3 years ago
6 0
Use the formula: P=IV, where P is power (watts), I is current (amperes) and V is potential difference (volts).

For the first heater:
900W = I_{1}*120V
I_{1} = 7.5A


For the second heater:
1800W = I_{2}*120V
I_{2} = 15A


For the third heater:
3000W = I_{3}*240V
I_{3} = 12.5A
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17.4 cm

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v = -25

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A jet fighter flies from the airbase A 300 km East to the point M. Then 350 km at 30° West of North.
It means : at 60° North of West. So the distance from the final point to the line AM is :
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Let`s assume that there is a line N on AM.
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And finally jet fighter flies 150 km North to arrive at airbase B.
NB = 303.1 + 150 = 453.1 km
Then we can use the Pythagorean theorem.
d ( AB ) = √(453.1² + 125²) = √(205,299.61 + 15,625) = 470 km
Also foe a direction: cos α = 125 / 470 = 0.266
α = cos^(-1) 0.266 = 74.6°
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Direction is : 15.4° East from the North. 
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