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A(n) 5.2 ohm resistor, a(n) 9.2 ohm resistor, and a(n) 14 ohm resistor are connected in series with 6.0V battery.

Determine the equivalent resistance for the circuit. Answer in units of ohms.

Note: I don't know where to start.

Problem 26.

A resistor with an unknown resistance is connected in parallel to a(n) 14 ohm resistor. When both resistors are connected in parallel to an emf source of 19 V, the current across the unknown resistor is measured with an ammeter to be 3.2 A.

What is the resistance of the unknown resistor? In units of ohm.

Note: What formula(s) should I use?

Problem 27.

Two resistors, A and B, are connected in series to a 12 V battery. A voltmeter connected across resistor A measures a potential difference of 6.7 V. When the two resistors are connected in parallel across the 12 V battery, the current in B is found to be 1.6 A. Find the resistance of B. Answer in ohms.

Note: What formula(s) should I use?