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Chapter 25 Electric Current and Direct
Chapter 25 Electric Current and Direct

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... TAP 409-1: Potential and field strength in a uniform electric field A flame provides a small number of ions, allowing a conductor to acquire the same potential as the place where you put it. So the flame probe provides a convenient way of measuring the potential at a point in an electric field. Here ...
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... 3. Let place the two junctions of the thermocouple at two different beakers, one in ice beaker and another in water filled beaker respectively. Now switch on the heater to increase the temperature of one of the junction placed in water filled beaker. 4. Notice the temperature of the two junctions by ...
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Galvanometer



A galvanometer is a type of sensitive ammeter: an instrument for detecting electric current. It is an analog electromechanical actuator that produces a rotary deflection of some type of pointer in response to electric current through its coil in a magnetic field.Galvanometers were the first instruments used to detect and measure electric currents. Sensitive galvanometers were used to detect signals from long submarine cables, and to discover the electrical activity of the heart and brain. Some galvanometers use a solid pointer on a scale to show measurements; other very sensitive types use a miniature mirror and a beam of light to provide mechanical amplification of low-level signals. Initially a laboratory instrument relying on the Earth's own magnetic field to provide restoring force for the pointer, galvanometers were developed into compact, rugged, sensitive portable instruments essential to the development of electrotechnology. A type of galvanometer that records measurements permanently is the chart recorder. The term has expanded to include use of the same mechanism in recording, positioning, and servomechanism equipment.
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