ANSWER:
40 ohms
Since Rt = R1 + R2 = R3
we have:
Rt = 20 ohms + 5 ohms + 15 ohms
Rt = 40 ohms
When the voltage drops across the resistors in a series circuit are
known, the total voltage may be calculated by using the formula
Et = ER1 + ER2 + ER3
= 20 volts + 30 volts + 50 volts
Et = 100 volts
The total voltage in a circuit may also be calculated by using the
formula derived from Ohm's law:
Et = It x Rt
= 1 amp X 100 ohms
Et = 100 volts
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IT0334
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