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What is the current in the circuit if R1=7 R 2 =15, and the voltage is 220 volts?

Sagot :

AL2006
You haven't mentioned whether the resistors are in series or in parallel.
It's kind of important, and the answers are different.

If they're in series:
The total resistance is (R1 + R2) = (7 + 15) = 22 ohms
Current = (voltage) / (total resistance) = (220) / (22) = 10 Amperes

If they're in parallel:
The total resistance is (R1 · R2) / (R1 + R2) = (7 · 15) / (7 + 15) = 105/22 ohms
Current = voltage / total resistance = 220 · 22 / 105 = 46.1 Amperes.

The poor power supply could probably not deliver 46.1A for very long,
so I'm guessing that the resistors are in series, and the current is 10A.
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