question number second how can you detect weak current
Dear Student,
1. LED
LEDs (Light Emitting Diode) will glow even when a small current passes through it. As the strength of the current increases , brightness of LED increases.
2. Magnetic compass.
Weak electric current flowing through a liquid can also be detected by using a compass.
We take out the cardboard tray from the inside of a discarded matchbox and place a small compass inside this cardboard tray.
When current passes , it will create a magnetic field and as a result the compass needle deflects.
Regards...........
1. LED
LEDs (Light Emitting Diode) will glow even when a small current passes through it. As the strength of the current increases , brightness of LED increases.
2. Magnetic compass.
Weak electric current flowing through a liquid can also be detected by using a compass.
We take out the cardboard tray from the inside of a discarded matchbox and place a small compass inside this cardboard tray.
When current passes , it will create a magnetic field and as a result the compass needle deflects.
Regards...........