![]() ![]() In every case of a rate quantity, the mathematical equation involves some quantity over time. Mathematically, power is the work per time ratio. And power is a rate quantity - the rate at which work is done on an object. Mathematically, acceleration is the velocity change per time ratio. Acceleration is a rate quantity - the rate at which an object changes its velocity. Mathematically, velocity is the position change per time ratio. ![]() For instance, velocity is a rate quantity - the rate at which an object changes its position. There are several rate quantities in physics. The current is simply the ratio of the quantity of charge and time.Ĭurrent is a rate quantity. As depicted in the diagram below, the current in a circuit can be determined if the quantity of charge Q passing through a cross section of a wire in a time t can be measured. As a physical quantity, current is the rate at which charge flows past a point on a circuit. Yet current is a physical quantity that can be measured and expressed numerically. Using the word current in this context is to simply use it to say that something is happening in the wires - charge is moving. It is said that there is a current - a flow of charge. If the two requirements of an electric circuit are met, then charge will flow through the external circuit. ![]()
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