Question

Ampere-second stands for the unit of
(A). Power
(B). Charge
(C). e.m.f.
(D). Energy

Answer 1

Hint: Ampere is the unit of electric current and second is the unit of time in the SI unit system. Ampere-second is the unit of charge.

Formula used:
$\text{Charge (coulomb, C) = Current (ampere, A) }\times \text{ Time (seconds, s)}$

Complete step by step answer:
Electric charge is defined as the amount of electricity flowing in a given system in a given time. To calculate the electric charge, we need to know the value of current flow and how long it flows for.
Equation for electric charge is:-
$\text{Charge (coulomb, C) = Current (ampere, A) }\times \text{ Time (seconds, s)}$
For example, if a current of 10 amperes is flowing in a circuit for 5 seconds, the value of electric charge would be $10\times 5=50\text{ ampere-seconds}$ or $50\text{ Coulombs}$.
Ampere-second is the unit for Charge.
Hence, the correct option is B.

Additional information:
The CGS electrostatic unit of charge is esu or statcoulomb. 1 Coulomb of electric charge is equal to approximately 3,000,000,000 esu, or one-tenth of emu. We can define 1 stat coulomb as: if two stationary objects each carry a charge of 1 statcoulomb then they will electrostatically repel each other with a force of value equal to 1 dyne.
SI unit of Power is Watt, SI unit of Electromotive force (emf) is Volts, and SI unit of Energy is Joule.

Note: The charge is that property of a matter due to which it experiences the force of attraction or repulsion in the presence of an electric field, while electric current is the rate of flow of charged particles called as electrons. Coulomb is the unit of electric charge and electric current is measured in Amperes.