URGENt ap physics help

Question

You are given three 2 ohm resistors, some wire, a variable DC voltage supply, a voltmeter and ammeter.

A. Draw a schematic diagram of a circuit that will produce an equivalent resistance of 3 ohms as well as measure the circuit current and source voltage.

 

b. Which, if any, of these components are assumed to have 0 internal resistance?Which, if any, of these components are assumed to have infinite resistance? Justify choices.

 

C. trace out one complete loop in your circuit and prove kirchoff's loop rule. Once you set up your rule, assume a setting of 6 volts on the power supply. verify your rule numerically. 

 

D. a student wishes to measure the voltage and current in a simple circuit using small lightbulbs instead of commercially manufactured resistors. she finds that after a short while, the current in the ammeter is decreasing. how might she account for this?

Answer 1

a)

  _________(V)____________

|                                              |

|             ____r____                |

|--(A)----|                |------r------|      will give you 3 Ω total.  measure total current and total voltage 

|             ------r-------                 |

|                                               | 

|------------battery-----------------|

 

b)  the wire is considered to have 0 resistance and does not inhibit current.

     the voltmeter is considered to have infinite resistance so there is virtually no current passing through it.