Electric Circuit

Electrical Science Volume 1 of 4
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DC CIRCUIT TERMINOLOGY Basic DC Theory TABLE 2 Temperature Coefficients for Various Materials Temperature Material Coefficient, W per °C Aluminum 0.004 Carbon -0.0003 Constantan 0 (avg) Copper 0.004 Gold 0.004 Iron 0.006 Nichrome 0.0002 Nickel 0.005 For a given material, a may vary with temperature; therefore, charts are often used to describe how resistance of a material varies with temperature. An increase in resistance can be approximated from equation (2-2). (2-2) R_t R_o R_o(aDT) where R_t = higher resistance at higher temperatures R_o = resistance at 20^oC a = temperature coefficient DT = temperature rise above 20^oC Electric Circuit Each electrical circuit has at least four basic parts: (1) a source of electromotive force, (2) conductors, (3) load or loads, and (4) some means of control. In Figure 13, the source of EMF is the battery; the conductors are wires which connect the various component parts; the resistor is the load; and a switch is used as the circuit control device. ES-02 Page 18 Rev. 0

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