Question

State Ohm's law in words. For what type of circuit elements does it correctly describe the behavior?

Does a light bulb have a constant resistance? Explain. Is a light bulb ohmic?

Does a resistor have a constant resistance? Explain. Is a resistor ohmic?

Answer #1

. **Ohm's Law** deals with the relationship between
voltage and current in an ideal conductor. This relationship states
that:

**The potential difference (voltage) across an ideal
conductor is proportional to the current through it.**

The constant of proportionality is called the "resistance",
**R**.

Ohm's Law is given by:

**V = I R**

where V is the potential difference between two points which
include a **resistance** R. I is the current flowing
through the resistance. For biological work, it is often preferable
to use the **conductance**, g = 1/R; In this form
Ohm's Law is:

**I = g V**

2. Material that obeys Ohm's Law is called
"**ohmic"** or "**linear"** because the
potential difference across it varies linearly with the
current.

3. Ohm's Law can be used to solve simple circuits. A complete circuit is one which is a closed loop. It contains at least one source of voltage (thus providing an increase of potential energy), and at least one potential drop i.e., a place where potential energy decreases. The sum of the voltages around a complete circuit is zero.

4. An increase of potential energy in a circuit causes a charge to move from a lower to a higher potential (ie. voltage). Note the difference between potential energy and potential.

Because of the electrostatic force, which tries to move a
positive charge from a higher to a lower potential, there must be
another 'force' to move charge from a lower potential to a higher
inside the battery. This so-called force is called the
**electromotive force**, or **emf**. The
SI unit for the emf is a volt (and thus this is not really a force,
despite its name). We will use a script E, the symbol , to represent the emf.

a)

A light bulb is not an ohmic resistor since the current through
it varies NON-LINEARLY with the applied voltage.

Ohmic resistors have a linear relationship between applied voltage
and the resulting current.

b)

The term, ohmic resistor, is actually a redundancy. Resistors by
definition have a (more or less) constant resistance, expressed in
ohms. Other devices whose resistance is dependent on some variable
have other, distinct, designations. Thermistors show a great
variation (sometimes negative) with temperatures, and varistors
show a large variation of resistance with applied voltage.

It can be argued that all resistors are thermistors, since all
known materials have resistivities which vary with temperature, so
ohmic resistor might be used to refer to an ideal resistor, whose
resistance would be invariate under all conditions.

describes what happens to the resistance of the light bulb as
the voltage is increased. Explain please as to why the resistance
changes. Does it follow Ohm's Law?
Describe how the resistance of the zener diode changes as the
voltage increases. Why are zener diodes not ohmic devices?

Design an experiment that verifies Ohm's Law. In other words,
describe (in a sentence or two) how you would conduct such an
experiment using the fixed resistor and variable voltage source.
Identify your dependent and independent variables and sketch a plot
with the independent variable on the x-axis and the dependent
variable on the y-axis. Include axes labels and the slope term of
the sketched plot and relate this to Ohm's Law.

1.In your Ohm's law lab if you let the current (I) in your
circuit remain constant, what will happen to the voltage (V) if the
resistance (R) is tripled?
2.If you connect a 10-Volt supply voltage across a parallel
combination of two 10 Ohm resistors, what should be the ammeter
reading connected in series with the voltage source?
3.When you check a 7-Amps reading on your multimeter connected
in series with a 3 Ohm resistor, what will the voltmeter reading...

State Mendel's Second Law, the Law of Independent Assortment and
what does the law mean in terms of the gametes produced by an
individual? Explain how the behavior of chromosomes in meiosis
provides the basis of independent assortment.

Suppose you have a circuit with a 10 volt battery hooked up to a
100 ohm light bulb and a variable resistor of R ohms. The light
bulb and the resistor can be hooked up in series or parallel. Draw
both these circuits and label them as series or parallel and with
the values of each component.
Now, solve for the current in the light bulb in each of these
circuits for R = 10, 100, and 1000 Ohms.
Given...

Please explain in your own words, what authorities does the
State Government have? Please don't copy paste from a website.

1. Describe, in your own words, the Phillips Curve. What does
the slope of the Phillips curve tell you? Draw the curve and mark
the axes correctly.
2. Consider a very flat (almost horizontal) Phillips curve. What
could go wrong if policymakers looked only at inflation rates to
determine if an intervention in the economy is required?

1) Describe opportunity identification for the entrepreneur.
2) In your own words, state what is meant by the term
innovation.
3) Name, and describe in detail one of the major misconceptions
commonly associated with innovation.
4) Explain the challenges in new venture development.
5) Provide an example of a financial decision that can cause a new
venture to fail. Explain in detail.
6) How can asking the right questions help an entrepreneur evaluate
a new venture? What sort of questions...

describe the typical composition and procedural
process of an appellate court. what type of argumentation does an
appellate court hear? Why are appellate court decisions important
to judiciary? Explain

1.What famous royal figure attended a formal lecture given by
Michael Faraday in the lat 1700’s at the Royal Institute?
2. The metropolitan water district supplies power to what major
US city?
3. One Ampere is one Coulomb of charge flowing through a circuit
in how many seconds?
4. Oerstead used the current flowing in a wire due to a voltaic
pile to show the link between electricity and magnetism, today
simply known as _________________________.
5. Wheatstone and Ohm showed...

ADVERTISEMENT

Get Answers For Free

Most questions answered within 1 hours.

ADVERTISEMENT

asked 12 minutes ago

asked 26 minutes ago

asked 32 minutes ago

asked 33 minutes ago

asked 41 minutes ago

asked 1 hour ago

asked 1 hour ago

asked 1 hour ago

asked 1 hour ago

asked 2 hours ago

asked 2 hours ago

asked 2 hours ago