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A 100 Ω resistor is connected to a 220 V, 50 Hz ac supply.
What is the rms value of current in the circuit?


Given, 

Resistance, R = 100 ΩVoltage applied, V = 220 V Frequency of the AC supply, f = 50 Hz 

 ω = 2π f = 2 ×3.14 × 50 = 314 

 Using the relation
                    Ieff = VeffR
Putting values,
                       Ieff =220100 = 2.2 A

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44 mH inductor is connected to 220 V, 50 Hz ac supply. Determine the rms value of the current in the circuit.


Given,
Inductance, L = 44 mH = 44 × 10-3H

Frequency of the Ac supply, f = 50 HzRms value of voltage, Erms = 220 V 

Inductive reactance is given by, XL = L.ω                                                             = L. 2πf                                                            = 44 × 10-3 × 2 × 3.14 × 50
Now,
                    Irms = ErmsXL         = 22044 ×10-3×2×3.14×50
                         = 15.9 A. 

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


Given,

Peak volatge, E0 = 300 VRms value of current,  Irms = 10 A 

Now,
Using the relation,

                     Erms = E02 

                           = 3002 = 3001.414 = 212.13 V

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


Given, 

Peak voltage, E0 = 300 VRms value of current, Irms = 10 A 

Hence, using the formula,

              Irms = I02
         
                 I0 = 2  Irms

                    = 2 × 10 = 14.1 A. 
which is the required value of peak current. 

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A 100 Ω resistor is connected to a 220 V, 50 Hz ac supply.
What is the net power consumed over a full cycle?

Given, 

Resistance, R = 100 ΩPotential applied, V = 220 ( effective voltage Veff)frequency, f = 50 Hz 

Since, ω = 2π f = 2 ×3.14 × 50 = 314 
Therefore,
Power consumed = Current x Voltage
                        = Ieff × Veff 

                        = 2.2 x 200
                        = 484 watt.


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