2. A re the resistance, by what factor does the power dissipated in the circuit

Question

2. A re the resistance, by what factor does the power dissipated in the circuit change? sistor is connected to a battery. If you replace the resistor with one that has twice 3. Three resistors connected in parallel have individual values of 4.0, 6.0 and 10.0 respectively. If this combination is connected in series with a 12.0 V battery and a 2.0 resistor, what is the current in the 2 resistor? 2.02 2V 4.0? 6.0 ? 10.0 ? A) 4.93 A B) 2.00 A C) 0.59 A D) 3.05 A E) 11.23 A There are 3 loops in a standing wave in a 4 m string oscillating at 60 Hz. What is the wavelength? A) 2.4 m B) 0.75 m C) 1.2 m D) 2.67m E) 6 m A 450 Hz siren is moving at 70 f's toward a person running away from it at 20 f's. What pitch does the persorn hear? (Vsound 1100 fs) A) 180 Hz B) 1260 Hz C) 471.8 Hz D) 158 Hz E) 900 Hz What is the 1t overtone frequency of a 3 ft clarinet? (Vsound 1100 f/s) Hz. A) 120 B) 275 C) 467 D) 550 E) 325 E a 600 w heater carries a current of 5 A, what is the resistance of the heating element ? A) 2.777778 ohm B) 24 ohm C) 20 ohm D) 120 ohm E) 48 ohm An increase of 30 dB increases the sound intensity by a factor of

Explanation / Answer

2. P = V^2 / R

now R - > 2 R

then P -> P/2 Ans(D)

3. 4, 6 and 10 ohm are in parallel,

1/R = 1/4 + 1/6 + 1/10

R = 1.94 A  

I = V / (R + 2) = 12 / (1.94 + 2) = 3.05 A Ans(D)

4. 3 ( lambda / 2) = 4

lambda = 2.67 m ANs(D)

  

Related Questions

Navigate

• Browse (All)
• Browse 2
• Subjects

---

---

Integrity-first tutoring: explanations and feedback only — we do not complete graded work. Learn more.