Electricity
True or False
When rubbing two materials, electrons may be transferred from one material to another.
TRUE
It can be magnetized in the presence of a magnetic field.
Temporary Magnet
1C/s is equal to
1 A
Give three descriptions of a capacitor
a device used to store electric charge
consists of two conducting plates separated by a thin insulating layer
it is widely used in electronic circuits
it blocks surges of charge and energy to protect circuits.
Give three examples of Ferromagnetic materials
iron, steel, nickel, cobalt
What is the difference between series and parallel circuit?
Series Circuit is a circuit that contains more than one electrical component connected one after the other in a single path.
Parallel Circuit is a circuit in which two or more electrical components are connected across each other in such a way that the current is distributed between them.
What are the properties of electric field lines? Give at least two.
Field lines must begin on positive charges and terminate on negative charges, or at infinity in the hypothetical case of isolated charges.
The number of field lines leaving a positive charge or entering a negative charge is proportional to the magnitude of the charge.
The strength of the field is proportional to the closeness of the field lines - more precisely, it is proportional to the number of lines per unit area perpendicular to the lines.
The direction of the electric field is tangent to the field line at any point in space.
How would you determine the amount of force experienced by a charged particle moving with velocity v in a magnetic field?
F = qvB
What are the factors that affect the resistance of a material? And explain their relationships with resistance.
Length - directly proportional
Cross-Sectional Area - inversely proportional
Resistivity - directly proportional
Temperature - directly proportional
A positive test charge of 5.0 x 10-4 C is in an electric field that exerts a force of 2.5 x 10-4 N on it. What is the magnitude of the electric field at the location of the test charge?
0.50 N/C
A muon (a particle with the same charge as an electron) is traveling at 4.21 x 107 m/s at right angles to a magnetic field. The muon experiences a force of 5.00 x 10-12 N. How strong is the field?
0.74 T
A four-slice toaster is rated at 1200 W and designed for use with 120-V circuits. What is the resistance of the toaster?
12 Ω