Galvanometer

What is the function of a galvanometer?

• Detects the presence of current in a circuit

• Shows the direction of current in a circuit

• Can measure small current

• Can measure small potential difference

• Can measure resistance of the circuit

Current sensitivity is ............

• Deflection produced by unit current

• Current needed to produce unit deflection

• Current needed to produce full scale deflection in galvanometer

• Voltage needed to produce full scale deflection

• Voltage needed to produce unit deflection

What are the resistances of ideal voltmeter and ammeter?

• zero, infinity

• infinity, zero

• very high , very low

• very low , very high

• infinity, infinity

How can a galvanometer be converted to a voltmeter?

• Connecting a high resistance in parallel to galvanometer

• Connecting a low resistance in series of galvanometer

• Connecting a high resistance in series of galvanometer

• Connecting a low resistance in parallel to galvanometer

How can a galvanometer be converted to an ammeter?

• connecting a low resistance in series to galvanometer

• connecting a high resistance in series to galvanometer

• connecting a low resistance in parallel to galvanometer

• connecting a high resistance in parallel to galvanometer

How can you increase the range of voltmeter?

• By increasing the resistance connected to the galvanometer

• By decreasing the resistance connected to the galvanometer

• Can't change the range

Can you change a voltmeter in to an ammeter?

• No

• Yes

Can you change an ammeter in to a voltmeter?

• Yes

• No

Can Moving Coil Galvanometer detect AC? why?

• Yes, deflection is proportional to current

• No, average current is zero for AC

Tags

NGSS.HS-PS2-5

How are the voltmeter and ammeter connected in circuit?

• series, parallel

• parallel, series

• parallel, parallel

• series, series