Exam 2 Flashcards
When two or more resistors are connected in parallel to a battery
All of the other choices are true ( voltage same, current flow is equal and resistance of combo is less than resistance of one resistor
A current reading is obtained by properly placing an ammeter in a circuit consisting of one resistor and one batter as a result
The current flowing in the circuit decreases
As more resistors are added in a series to a Constance voltage source the power supplied by the source
Decreases
Kirchhoff junction rule is an example of
Conservation of charge
A blown fuse has
Infinite very large resistance
As more resistors are added in parallel to a constant voltage source the power supplied by the source
Increases
The minimum current that will usually kill the average person is
0.1A
An ideal ammeter should
Introduce a very small series resistance into the circuit whose current is to be measured
When charging a battery, the terminal voltage is blank the battery emf
More than
Which of the following material has the largest conductivity at 20C
Silver
Consider two copper wires. One has twice the length and twice the cross sectional area of the other how does the resistance of these two wires compare
Both wires have the same resistance
The resistivity of most common metals
Increases as the temp increases
A device that doesn’t obey OHms law is a
Light bulb
What do you buy from the power company
Energy
Consider a current moving from left to right through a resistor which end of the resistor is at higher potential
Left
The resistance of a object is defined as
Voltage/current
Negatvie temperature cooefficients of resistivity
Exist in semiconductors
If the resistance in a constant voltage circuit is doubled the power dissipated by that circuit will
Decreased by one half its original value
A potential difference is applied to the ends of an object causing a current I to flow through it. If the object obeys OHms law we can obtain the resistance by
Dividing voltage by the current
A Coulomb per second is the same as
An ampere
