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Welcome
You can get up to rs50 recharge

How to check a coponent that work or not work on circuit

Turn on multimeter and  select the circuit to test.turn the multimeter knob to  buzz or test mode.connect the  positive wire to the component's  one side and connect the negative wire to the component's other side few second wait and the a sound producing like a buzz and the component is working.if the sound is not hear and the component is not working need to replace.note do not turn  on the circuit while checking it cause the multimeter to damage

How to make a magnet

Actually electromagnet are temporary magnet.it is not a permanent magnet.it works when the elctricity pass through them.we can make a simple magnet.need things to magnet are 1.cell(using pencil cell or 9vcell or other) 2.metal(like iron etc)3.insulator wire or copper wire 4.one switch (optional)
Use a large wire connect the wire one side to the cell and the other end of wire wind the metal or coiling the metal.the remaing wire connect to the switch(not available connect to the cell directly)turn one cell wait few second the magnet ready to attract any metal object.increasing of the coil or wind yo the metal to increasing the attraction force

How to make a radio station

We can easy make radio circuit but we know about. How to simple radio broadcast station.simple broadcast station require components are capacitor,inductor,resistor etc.the inductor is signal send act as a tower and the capacitor is act as a sound booster and circuit current booster.we connect a mic to the circuit and speak when the circuit works the inductor send signals to the real FM station but the signal range is low at 30m radius.