- #1
nekteo
- 9
- 0
a cable with total resistance of 2 ohms used to transfer 15000W of electrical power with electrical potential of 10000 V.
How much electrical energy is lose in the cable after transferring 2 hours of electrical power?
------------this is how my teacher taught me, but still confused----------
P = VI
15000 = 10000 I
I = 1.5 A
V = IR
V = 1.5 * 2
V = 3
E = VIt
E = 3 * 1.5 * (2 * 60 * 60)
E = 32400 J
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What i don't understand is, since the question has provided me with 10000V, why should i find another voltage (1.5V)? It's impossible for a cable to have 2 completely different voltage (1.5V and 10000V) is it?
My question is, what is 1.5V and 10000V?
Why can't i just use,
E = Pt
E = 15000 * (2 * 60 * 60)?
HELP! I know my English is not good enough... sorry for that.
How much electrical energy is lose in the cable after transferring 2 hours of electrical power?
------------this is how my teacher taught me, but still confused----------
P = VI
15000 = 10000 I
I = 1.5 A
V = IR
V = 1.5 * 2
V = 3
E = VIt
E = 3 * 1.5 * (2 * 60 * 60)
E = 32400 J
-----------------------------------------------------------------------
What i don't understand is, since the question has provided me with 10000V, why should i find another voltage (1.5V)? It's impossible for a cable to have 2 completely different voltage (1.5V and 10000V) is it?
My question is, what is 1.5V and 10000V?
Why can't i just use,
E = Pt
E = 15000 * (2 * 60 * 60)?
HELP! I know my English is not good enough... sorry for that.