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A circuit with a 60 V battery, a 7 Ω resistor, a resistor with 0.2 A across it, and another 7 Ω resistor in series. What is the resistance of the unknown resistor?
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A circuit with a 60 V battery, a 7 Ω resistor, a resistor with 0.2 A across it, and another 7 Ω resistor in series. What is the resistance of the unknown resistor?

User Dare
by
4.9k points

1 Answer

11 votes

Answer:

28.6 ohm

Step-by-step explanation:

there is a 3rd resistor in series. voltage drop across the resistors will be equal to 60v

7*.2+7*.2 +.2x = 60

2.8+.2x = 60

.2x = 57.2

x = 28.6

User Honza Pokorny
by
5.0k points
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