This solution evaluates the provided statements regarding electric cells to identify the correct one.
\(\mathcal{E} = \frac{P}{I}\)
The unit of EMF is the Volt (V), which is equivalent to Joules per Coulomb (J/C).Based on the analysis, the only correct statement is that the emf of a battery is the power provided by the battery per unit current.
An electric bulb is connected to a 110 V generator. The current is 0.2 A. What is the power of the bulb ?
Two metallic wires made from copper have same length but the radius of wire 1 is half of that of wire 2. The resistance of wire 1 is R. If both the wires are joined together in series, the total resistance becomes
A parallel-plate capacitor of capacitance C 1is made using two gold plates. Another parallel-plate capacitor of capacitance C 2is made using two aluminium plates with same plate separation, and all the four plates are of same area. If ρ gand ρ aare respectively the electrical resistivity of gold and aluminium, then which one of the following relations is correct?
A parallel-plate capacitor, with air in between the plates, has capacitance C. Now the space between the two plates of the capacitor is filled with a dielectric of dielectric constant 7. Then the value of the capacitance will become
The r.m.s. potential difference between the red live wire and black neutral wire in Indian domestic electric supply is
An electric circuit is consisting of a cell, an ammeter and a nichrome wire of length l. If the length of the wire is reduced to half (l/2), then the ammeter reading
A metal wire of length l and diameter d has a resistance R. What would be the resistance of another wire of the same metal and of the same length but having double the diameter?
Which of the following is a bad conductor of electricity?
In general, in an alternating current circuit
The laws of electromagnetic induction have been used in the construction of a
A 220 volt and 100 watt bulb is connected to a 110 volt source. The power consumption by the bulb is
In the series combination of resistance in current electricity, which of the following is correct?