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CEDIA ESPA EST Practice Test

Category - DHTI

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What is the impedance of a 10 ohm and 20 ohm speaker wired in parallel?

2.66 Ohms
6.66 Ohms
4 Ohms
30 Ohms

Explanation

Answer - B - The impedance of a 10 ohm and 20 ohm speaker wired in parallel is 6.66 Ohms.

Key Takeaway: The equivalent resistance of two resistors connected in parallel is Req = R1 × R2/ (R1 + R2). Substituting the values of the two resistors Req = 200/30 = 6.66 Ohms.

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