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CareerMall – your one-stop job portal

Are you on a job hunt or looking for a suitable employee? NTU's CareerMall has a comprehensive range of services to help you.

Jobseekers

CareerMall, a one-stop job portal, is a FREE resource for both NTU students and alumni. Owned and managed by JobsCentral, it enables registered jobseekers to search for jobs, store resumes and cover letters, create job alerts and keep track of employers' requests for published resumes.

Users can also register online for career workshops/talks, recruitment events, career counselling and more. They can even surf for the latest news, information and advice on career-related issues on the portal's JobsCentral Community.

Employers

Those looking for candidates to fill vacancies in their organisation can sign up for an employer's account and post their recruitment ads online. What's more, you can invite applications from students and graduates of NTU, as well as mine their published resumes.

Widen your career prospects. Broaden your recruitment pool. Check out the various career opportunities now!

If you have any queries, please contact Lora Wong from the Career & Attachement Office at 6790 4451 or email her.

Careermall is a website which can help you to grow up your career. We believe that there is unlimited opportunity to growth your career. We guide you to find the proper way how to choose a smart and best career for you.

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GENERAL PHYSICS 242 Help- mastering physics

Overview of Chapter 25:

Click here: Download Chapter 25 Answer Sheet of GENERAL PHYSICS 242 

To understand the nature of electric current and the conditions under which it exists.

Electric current is defined as the motion of electric charge through a conductor. Conductors are materials that contain movable charged particles. In metals, the most commonly used conductors, such charged particles are electrons. The more electrons that pass through a cross section of a conductor per second, the greater the current. The conventional definition of current is

I=QtotalΔt,

where I is the current in a conductor and Qtotal is the total charge passing through a cross section of the conductor during the time interval Δt.

The motion of free electrons in metals not subjected to an electric field is random: Even though the electrons move fairly rapidly, the net result of such motion is that Qtotal=0 (i.e., equal numbers of electrons pass through the cross section in opposite directions). However, when an electric field is imposed, the electrons continue in their random motion, but in addition, they tend to move in the direction of the force applied by the electric field.

In summary, the two conditions for electric current in a material are the presence of movable charged particles in the material and the presence of an electric field.
Quantitatively, the motion of electrons under the influence of an electric field is described by the drift speed, which tends to be much smaller than the speed of the random motion of the electrons. The number of electrons passing through a cross section of a conductor depends on the drift speed (which, in turn, is determined by both the microscopic structure of the material and the electric field) and the cross-sectional area of the conductor.
In this problem, you will be offered several conceptual questions that will help you gain an understanding of electric current in metals.

Q.2:

At room temperature, what is the strength of the electric field in a 12-gauge copper wire (diameter 2.05 mm ) that is needed to cause a 3.90 A current to flow?

Q.3:

What diameter must a copper wire have if its resistance is to be the same as that of an equal length of aluminum wire with diameter 2.44 mm ?

Q.4:

A carbon resistor is to be used as a thermometer. On a winter day when the temperature is 4.0 ∘C, the resistance of the carbon resistor is 217.6 Ω .

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