The reading on Voltmeter 1 (V1 ) indicates the EMF(Voltage) of the battery pack (that is the total voltage to the circuit.) “supplied” This voltage is divided proportionally across the two resistors in the series circuit; so that V1= V2 + V3. Also note that this is a series circuit so the current is the same everywhere in the circuit. We assume here that no current flows through the Voltmeters (this is a pretty good assumption.) You must push the on/off button to complete the circuit. When the button is pushed the magnet should swing and ring the bell. If it does not, reverse the electromagnet’s leads. * Given the above set-up you are to determine the current flowing in the series circuit the resistance of the circuit the resistance of the electromagnet’s winding (Ohm’s law will be useful. Consult the appendix for assistance on calculations) 2. Resistance of the long line Now assemble the apparatus as shown below, including the long lengths of wire(wrapped around a spool for your convenience) which mimic the long lengths of wire which would feature in a telegraph system. *Now the value of resistance of the electromagnet, determine by measurement and calculation: the new current of the circuit the new total resistance the extra resistance introduced by adding the long lines of wire. *What has happened to the value of the current in the circuit?
The reading on Voltmeter 1 (V1 ) indicates the EMF(Voltage) of the battery pack (that is the total voltage “supplied” to the circuit.) This voltage is divided proportionally across the two resistors in the series circuit; so that V1= V2 + V3. Also note that this is a series circuit so the current is the same everywhere in the circuit. We assume here that no current flows through the Voltmeters (this is a pretty good assumption.) You must push the on/off button to complete the circuit. When the button is pushed the magnet should swing and ring the bell. If it does not, reverse the electromagnet’s leads. * Given the above set-up you are to determine the current flowing in the series circuit the resistance of the circuit the resistance of the electromagnet’s winding (Ohm’s law will be useful. Consult the appendix for assistance on calculations) 2. Resistance of the long line Now assemble the apparatus as shown below, including the long lengths of wire(wrapped around a spool for your convenience) which mimic the long lengths of wire which would feature in a telegraph system. *Now the value of resistance of the electromagnet, determine by measurement and calculation: the new current of the circuit the new total resistance the extra resistance introduced by adding the long lines of wire. *What has happened to the value of the current in the circuit?