Three equal resistors connected in series with a source of e m f together dissipate 10 W of power each. What will be the power dissipated if the same resistors are connected in parallel across the same source of e m f ?

Related Mcqs:

1. n an LCR series circuit, if V is the effective value of the applied voltage VR is the voltage across R VL is the effective voltage across L & Vc is the effective voltage across C then_______________?

   IA. V = VR+VL+VC B. V2 = VR2+VL2+VC2 C. V2 = VR2+(VL-VC)2 D. V2 = VL2+(VR-VC)2...

2. Three bulbs are rating 40W 60W and 100W designed to work on 220V mains. Which bulb will burn most brightly if they are connected in series across 220 V mains ?

   A. 40 W bulb B. 60 W blub C. 100 W blub D. all will burn equally brightly...

3. A voltage V = V0 cos ωt is applied across a resistor of resistance R the average power dissipated per cycle in the resistor is given by___________?

   A. V√/√2R B. V/√2√R C. V02/√2R D. 2/√2√R...

4. When a pure inductor of inductance L and a pure capacitor of capacitance C are connected in parallel to a sinusoidal potential difference V the potential difference across both L & C will be_______________?

   A. Same B. Different C. At L will be more than at C D. At L will be less than at C...

5. All electrical appliances are connected in parallel to each other between the main line and neutral wire to get ______________________?

   A. same current B. same current and potential difference C. different current but same potential difference D. different current and potential differences...

6. A 10Ω electric heater is connected to a 220V 50Hz mains supply. What is the peak value of the potential difference across the heater element ?

   A. 220V B. 220/ 2V C. 110V D. 220 √2V...

7. A 100µF capacitor with a 12V source in series having frequency 50Hz will offer a capacitive reactance of about______________?

   A. 32Ω B. 62Ω C. 50Ω D. 100Ω...

8. The average power and instantaneous power become equal if work is done at __________________?

   A. any rate B. at variable rate C. at uniform rate D. at high rate...

9. At resonance the value of the power factor in an L-C-R series circuit is_______________?

   A. Zero B. 2 C. 1 D. Not definite...

10. The resultant of two forces of equal magnitudes is also equal to the magnitude of the forces. The angle between the two forces is________________?

    A. 30° B. 60° C. 90° D. 120°...