60.

Fig. 7 represents a series RC circuit, connected across a DC voltage source.

The value of R and the value of C determine the RC

TIME CONSTANT of the circuit.

The RC TIME CONSTANT of any RC circuit is THE TIME THAT IT TAKES A CAPACITOR TO

CHANGE ITS CHARGE BY 63%. (Actually 63.2%, but for simplicity and ease of explanation, we use

63%).

Since 63% IS a constant, it will hold true regardless of the value of R and C.

In an RC circuit, THE TIME THAT IT TAKES A CAPACITOR TO CHANGE ITS CHARGE

BY 63% is the

of the circuit.

RC time constant

61.

If we know the RC TIME CONSTANT of an RC circuit, we know how long it will

take the capacitor to change its charge by 63%. The RC TIME CONSTANT of an RC

circuit is: