Frequency – one of the main characteristics of alternating current which is made by generators. It can be measured by means of a usual tester, with the corresponding settings. It is possible to change frequency, regulating settings of the generator or inductance and capacity in a chain.
It is required to you
- Generator of alternating current, condenser, inductance coil, tester
Instruction
1. Alternating current appears in the frame from the conductor rotating in constant magnetic field with some angular speed. As angular speed in direct ratio depends on frequencies rotations, increase or reduce the frequency of alternating current, reducing or increasing the frequency of rotation of windings of the generator. For example, having increased the frequency of rotation of windings of the generator twice, we will receive increase in frequency of alternating current in as much time.
2. If alternating voltage moves in network, then its frequency can be changed, using the coil of inductance and the condenser in a chain. Install the coil of inductance and the condenser in network, having connected them in parallel. Such oscillatory contour will create the frequency of fluctuations. In order that to calculate it by means of the tester tuned into measurement of inductance find this size for this concrete coil. After that, determine condenser capacity in a contour, using the same tester, only with settings for measurement of electric capacitance.
3. Connect a system to a source of alternating current, at the same time its active resistance has to be insignificant. This oscillatory contour will create own frequency which will be the cause of emergence of capacitive and inductive resistance in a chain. To find its value: 1. Find the work of the values of inductance and electric capacitance measured by means of a tester.2. Take a square root.3 from the value which turned out in Paragraph 1. Increase the received result by number 6.28.4. Divide number 1 into the value received in Paragraph 3.
4. At change of frequency of current it is necessary to consider that fact that if the frequency of network and frequency of a contour coincide, there will come the phenomenon of a resonance at which the maximum values of current and EMF considerably will increase and a chain can fuse.