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

The rms value of current in an ac circuit is 10 A. What is the peak current? - Physics

Advertisements
Advertisements

प्रश्न

The rms value of current in an ac circuit is 10 A. What is the peak current?

संख्यात्मक

उत्तर

The rms value of current is given as:

I = 10 A

Now, the peak current is given as:

`"I"_0 = sqrt2  "I"`

= `10sqrt2`

= 14.1 A

shaalaa.com
  या प्रश्नात किंवा उत्तरात काही त्रुटी आहे का?
पाठ 7: Alternating Current - Exercise [पृष्ठ २६६]

APPEARS IN

एनसीईआरटी Physics [English] Class 12
पाठ 7 Alternating Current
Exercise | Q 7.2 (b) | पृष्ठ २६६
एनसीईआरटी Physics [English] Class 12
पाठ 7 Alternating Current
Exercise | Q (b) | पृष्ठ २६६

व्हिडिओ ट्यूटोरियलVIEW ALL [1]

संबंधित प्रश्‍न

In a series LCR circuit connected to an ac source of variable frequency and voltage ν = vm sin ωt, draw a plot showing the variation of current (I) with angular frequency (ω) for two different values of resistance R1 and R2 (R1 > R2). Write the condition under which the phenomenon of resonance occurs. For which value of the resistance out of the two curves, a sharper resonance is produced? Define Q-factor of the circuit and give its significance.


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


A constant current of 2.8 A exists in a resistor. The rms current is


The household supply of electricity is at 220 V (rms value) and 50 Hz. Find the peak voltage and the least possible time in which the voltage can change from the rms value to zero.


An electric bulb is designed to operate at 12 volts DC. If this bulb is connected to an AC source and gives normal brightness, what would be the peak voltage of the source?


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 coil of inductance 5.0 mH and negligible resistance is connected to the oscillator of the previous problem. Find the peak currents in the circuit for ω = 100 s−1, 500 s−1, 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. 


A small town with a demand of 800 kW of electric power at 220 V is situated 15 km away from an electric plant generating power at 440 V. The resistance of the two wire line carrying power is 0.5 Ω per km. The town gets power from the line through a 4000-220 V step-down transformer at a sub-station in the town.

(a) Estimate the line power loss in the form of heat.

(b) How much power must the plant supply, assuming there is negligible power loss due to leakage?

(c) Characterise the step up transformer at the plant.


The peak value of the a.c. current flowing throw a resistor is given by ______.

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,


RMS value of an alternating current flowing in a circuit is 5A. Calculate its peak value.


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×