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The volume knob on a radio varies the resistance on a line that goes to the speakers. At a low volume the resistance is 10,000 Ω. At a high volume the
Question

The volume knob on a radio varies the resistance on a line that goes to the speakers. At a low volume the resistance is 10,000 Ω. At a high volume the resistance is 10 Ω. If the stereo maintains 35 volts into the speaker then, what are the two currents going into the speaker?

A.

1 milli amperes and 1 amperes

B.

10 milli amperes and 10 amperes

C.

3.5 milli amperes and 3.5 amperes

D.

0.35 milli amperes and 10 amperes

Correct option is C

The correct answer is: C) 3.5 mA and 3.5 A Using Ohm’s law: I = V/R
· At 10,000 Ω: I = 35 / 10,000 = 0.0035 A = 3.5 mA
· At 10 Ω: I = 35 / 10 = 3.5 A
Information Booster: • Ohm’s Law relates voltage, current, and resistance (V = IR). • Lower resistance allows higher current.

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