The most common control device is the electric switch, the object _____ is to turn an electric current on or off by completing or breaking its circuit.
举一反三
- If _____ voltage is applied across _____ circuit, _____ electric current will flow in _____ circuit.
- Power supply, the conductor, the control device and ______ are four basic parts of an electric circuit
- If _____ voltage is applied across circuit, electric current will flow in circuit. A: a B: an C: the D: 不填冠词
- The inductance of an electric device is independent of the electric current it carries. A: 正确 B: 错误
- ____ ()<br/>electric current ()nto A: circuit as B: result either of C: (fault)<br/>in the