Advertisements
Advertisements
प्रश्न
A bulb rated 60 W at 220 V is connected across a household supply of alternating voltage of 220 V. Calculate the maximum instantaneous current through the filament.
Advertisements
उत्तर
Power of the bulb, P = 60 W
Voltage at the bulb, V = 220 V
RMS value of alternating voltage, Erms = 220 V
P = V2R,
where R = resistance of the bulb
`therefore R = v^2/P = (220xx220)/60`
=806.67
Peak value of voltage (E_0) is given by,
`i_0 = E_0/R`
`⇒ i_0 = (311.08)/806.67 = 0.39 A `
APPEARS IN
संबंधित प्रश्न
The peak voltage of a 220 V AC source is
The AC voltage across a resistance can be measured using
A transformer has 50 turns in the primary and 100 in the secondary. If the primary is connected to a 220 V DC supply, what will be the voltage across the secondary?
Compare resistance and reactance.
When an AC voltage of 220 V is applied to the capacitor C ______.
- the maximum voltage between plates is 220 V.
- the current is in phase with the applied voltage.
- the charge on the plates is in phase with the applied voltage.
- power delivered to the capacitor is zero.
In an alternating current circuit consisting of elements in series, the current increases on increasing the frequency of supply. Which of the following elements are likely to constitute the circuit?
The resistance of a coil for d.c. is 5 Ω. In a.c., the resistance will ______.
What does \[t\] represent?
Which relation expresses that the voltage across the capacitor equals the applied voltage?
What is the peak current in a capacitor connected to an AC source?
How does a lamp in series with a capacitor behave when connected to an AC source?
How does the current in a capacitor connected to an AC source compare in phase with the voltage?
What happens to the capacitive reactance if the frequency is doubled while capacitance stays the same?
What happens to the iron when an iron rod is inserted into the interior of an inductor connected to an AC source?
How does inserting an iron rod into the interior of the inductor affect the inductance of the coil?
