18.1 Electric Current
e
e

e
e
ee
e
A metal wire.
e
Assume electrons
flow to the right.
q
Current : I
t
Current is a measure of the amount
of charge that passes though an area
perpendicular to the flow of charge.
Current units: 1C/sec = 1 amp
1
A
Electric Potential
Electric potential is the electric potential energy per unit
charge.
Ue
V
qtest
Electric potential (or just potential) is a measurable scalar
quantity. Its unit is the volt (1 V = 1 J/C).
1
For a point charge of charge Q:
U e kQ
V
qtest
25turn coil of wire
100turn coil of wire
Procedure:
1. Attach the single loop of wire
to the galvanometer, as shown
in Figure 1. Thrust one of the
bar magnets through the coil.
Record your observations in
Item 1 of Observations and
Data.
2. Move the gal
The circuit provided has
a large enough
that OF
dataAN
may
taken using a timer
MEASURING
THE time
TIMEconstant
CONSTANT
RCbe
CIRCUIT
and voltmeter. The data can then be graphed, and the shape of the graph and value of the
Object:
The object
thisbe
experim
Natalie Lorena
W0462515
PLAB19403
Lab 9: Joules Law
INTRODUCTION
In this lab, we explore Joules Laws to find Joules constant from a closed system. As
current flows through a resistor it heats up and goes into the surroundings. In a closed system,
energy
Natalie Lorena
W0462515
PLAB 19403
Lab 8: RC Circuits
Introduction
In this lab, we explore the potential difference across a capacitor in a series RC circuit as
time passes by observing the potential difference for charging and discharging the capacitor
Natalie Lorena
W0462515
PLAB 19403
Lab 2: Electric Potential
Introduction:
This lab explores the relationship between electric potential and electric field. Electric potential
is the electric potential energy per unit charge given by V=Ue/qtest and for a
Natalie Lorena
W0462515
PLAB 19403
Lab 4: Series and Parallel Circuits
Introduction:
In this lab, we explore series and parallel circuits. In a circuit that is in series, the current through two
resistors is the same as it flows around the circuit, but t
Natalie Lorena
W0462515
PLAB19403
Lab 3: Ohms Law
Introduction:
In this lab, we explore Ohms law which is V=IR to determine if a material is considered ohmic. If the
material is ohmic, then the relationship between current (I) and potential difference (V
Physics Lecture Problems:
20.45:
In a circuit, a parallel combination of a 10.0 resistor and a 7.0mH inductor is connected in
series with a 5.0 resistor, a 6.0V dc battery, and a switch. What is the initial current in the 7.0mH inductor? (c) What is t
Unit 2 Homework Questions
The Electric Field:
Point charges are placed at three corners of a rectangle, as shown in the figure.
What is the electric field at the fourth corner? A small object with a charge of +8.0 C is placed
at the fourth corner. What fo
W0462515
PLAB 19304
Natalie Lorena
Air Resistance
Introduction:
In this lab, coffee filters were used to show air resistance on a falling object using the
equation Fai r= cv2 as a model. According to this equation, the force of air resistance is
proporti
PLAB 193
W0462515
Natalie Lorena
Vectors and Friction Lab
Introduction:
In this lab, we practiced adding vectors to an object in equilibrium to see if they add up to
be zero which they should if the object is in equilibrium. For the second part of the lab