Figure 7 Time Constant

Figure 6 DC Current Through an Inductor

Figure 8 Voltage Applied to an Inductor

Electrical Science Volume 2 of 4
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DC Circuits INDUCTANCE The relationship between values of current reached and the time it takes to reach them is called a time constant. The time constant for an inductor is defined as the time required for the current either to increase to 63.2 percent of its maximum value or to decrease by 63.2 percent of its maximum value (Figure 7). Figure 7 Time Constant The value of the time constant is directly proportional to the inductance and inversely proportional to the resistance. If these two values are known, the time constant can be found using Equation (3-5). (3-5) T_L L R where T_L = time constant (seconds) L = inductance (henries) R = resistance (ohms) Rev. 0 Page 5 ES-03

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