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- a galvanometer is a tool that detects small currents or small p.d.s., often of the order of milliamperes or millivolts
- Hello everyone, welcome to physics class, today we are going to learn about moving- coil galvanometer.
- so who knows how a simple moving- coil galvometer work?
- A moving coil galvanometer works on the principle that a current-carrying coil placed in a magnetic field, experiences a torque. The moving coil galvanometer springs along with the radial field ensure the deflection to be proportional to the strength of the current.
- and please explain why an ammeter should have a very low resistance and a voltmeter should have a very high resistance
- yes , that is correct. now who can tell me how can we modify it for use as an ammeter and a volt meter
- A galvanometer can be converted into an ammeter by connecting a shunt resistance in parallel . A moving-coil galvanometer can be converted into a voltmeter by increasing its effective resistance and connecting it to a high resistance Rs in series with the galvanometer
- Ammeters should have low resistance as it is always connected in series with the circuit. Voltmeter is always connected in parallel with the load
- yes, that is correct. and for further information about galvanometer will be explained tomorrow and we will also conduct an experiment so dont forget to bring your lab coats
- okay mr we will, thank you for todays lesson
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