A power of 50 kWkW (5.0×104 WW) is delivered to the other side of a city by a pair of power lines, between which the voltage is 12,000 VV. 1. Use the formula P=IVP=IV to find the current in the lines. 2. If each of the two lines has a resistance of 15 ΩΩ, find a change of voltage along each line. (Think carefully. This voltage change is along each line, not between the lines.). 3. Find what is the power expended as heat in both lines together (distinct from power delivered to customers). 4.How do your calculations support the importance of stepping voltages up with transformers for long-distance transmission?
Ohm's law
Ohm’s law is a prominent concept in physics and electronics. It gives the relation between the current and the voltage. It is used to analyze and construct electrical circuits. Ohm's law states that the voltage across a conductor is directly proportional to the current flowing through it.
Path of Least Resistance
In a series of alternate pathways, the direction of least resistance is the actual or metaphorical route that offers the least resistance to forwarding motion by a given individual or body.
A power of 50 kWkW (5.0×104 WW) is delivered to the other side of a city by a pair of power lines, between which the voltage is 12,000 VV.
1. Use the formula P=IVP=IV to find the current in the lines.
2. If each of the two lines has a resistance of 15 ΩΩ, find a change of voltage along each line. (Think carefully. This voltage change is along each line, not between the lines.).
3. Find what is the power expended as heat in both lines together (distinct from power delivered to customers).
4.How do your calculations support the importance of stepping voltages up with transformers for long-distance transmission?
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