हिंदी
कर्नाटक बोर्ड पी.यू.सी.पीयूसी विज्ञान 2nd PUC Class 12

The peak voltage of an ac supply is 300 V. What is the rms voltage? - Physics

Advertisements
Advertisements

प्रश्न

The peak voltage of an ac supply is 300 V. What is the rms voltage?

संख्यात्मक
Advertisements

उत्तर

Peak voltage of the ac supply, V0 = 300 V

Rms voltage is given as:

`"V" = "V"_0/sqrt2`

= `300/sqrt2`

= 150 `sqrt2` V

= 150 × 1.414 V

= 212.1 V

shaalaa.com
  क्या इस प्रश्न या उत्तर में कोई त्रुटि है?
अध्याय 7: Alternating Current - EXERCISES [पृष्ठ २००]

APPEARS IN

एनसीईआरटी Physics [English] Class 12
अध्याय 7 Alternating Current
EXERCISES | Q 7.2 (a) | पृष्ठ २००

वीडियो ट्यूटोरियलVIEW ALL [1]

संबंधित प्रश्न

The voltage and current in a series AC circuit are given by V = V0cos ωt and i = i0 sin ωt. What is the power dissipated in the circuit?


Two alternating currents are given by `i_1 = i_0 sin wt and i_2 = i_0 sin (wt + pi/3)` Will the rms values of the currents be equal or different?


Can a hot-wire ammeter be used to measure a direct current of constant value? Do we have to change the graduations?


An alternating current of peak value 14 A is used to heat a metal wire. To produce the same heating effect, a constant current i can be used, where i is


Find the time required for a 50 Hz alternating current to change its value from zero to the rms value.


The dielectric strength of air is 3.0 × 106 V/m. A parallel-plate air-capacitor has area 20 cm2 and plate separation 0.10 mm. Find the maximum rms voltage of an AC source that can be safely connected to this capacitor.


A capacitor of capacitance 10 μF is connected to an oscillator with output voltage ε = (10 V) sin ωt. Find the peak currents in the circuit for ω = 10 s−1, 100 s−1, 500 s−1 and 1000 s−1.


A resistor of resistance 100 Ω is connected to an AC source ε = (12 V) sin (250 π s−1)t. Find the energy dissipated as heat during t = 0 to t = 1.0 ms.


In a series RC circuit with an AC source, R = 300 Ω, C = 25 μF, ε0 = 50 V and ν = 50/π Hz. Find the peak current and the average power dissipated in the circuit.


Answer the following question.
A small town with a demand of 1200 kW of electric power at 220 V is situated 20 km away from an electric plant generating power at 440 V. The resistance of the two wirelines carrying power is 0.5 Ω per km. The town gets the power from the line through a 4000-220 V step-down transformer at a sub-station in the town. Estimate the line power loss in the form of heat. 


Do the same with the replacement of the earlier transformer by a 40,000-220 V step-down transformer (Neglect, as before, leakage losses though this may not be a good assumption any longer because of the very high voltage transmission involved). Hence, explain why high voltage transmission is preferred?


If `|vec"A" xx vec"B"| = sqrt3 vec"A" . vec"B"` then the value of  is `|vec"A" xx vec"B"|` is


In a transformer Np = 500, Ns = 5000. Input voltage is 20 volt and frequency is 50 HZ. Then in the output, we have,


When a voltage measuring device is connected to AC mains, the meter shows the steady input voltage of 220V. This means ______.


In the Figure below, the current-voltage graphs for a conductor are given at two different temperatures, T1 and T2.

 

  1. At which temperature T1 or T2 is the resistance higher?
  2. Which temperature (T1 or T2) is higher?

Share
Notifications

Englishहिंदीमराठी


      Forgot password?
Use app×