Q3 Examination Flashcards
- Study of all phenomena associated with electric charges at rest.
- Static electricity- electricity at rest
Electrostatics
can be transferred from atom to atom
Electric charge
deficiency in electrons
positively charged
have more electrons
negatively charge
States that the total charge of an isolated system remains constant.
Conservation of charge
States that the force of attraction or repulsion between two charged bodies is directly proportional to the product of their charges and inversely proportional to the square of the distance between them.
Coulomb’s law
- Surrounding a charged body
- Causes any charged particle to experience electric force
- Electric force is a noncontact force
Electric Fields
- Positive and negative charge never cross one another (intersect or break as they pass each other.)
- start from positively charged particles and end on negatively charged particles (A positive and negative charge are separated by a certain distance. The electric field between them points toward the negative charge.)
Electric lines of force
What is the charge if it points away
Positive charge
What is the charge if it points toward
Negative charge
- The strength of the electric field at a point due to the source of energy.
- is directly proportional to charge but inversely proportional to distance.
Electric field intensity (E)
- They point radially away from the charge
- They are in the same direction with electric field lines.
- They always point to the negative charge.
Electric Potential lines
- is the amount of work needed to move a test charge from a large distance.
- is directly proportional to work
- is directly proportional to potential difference (commonly known as voltage)
- is directly proportional to the charge
Electric Potential
the device used to store charges
Capacitor
the amount of charge stored per volt
Capacitance
unit of capacitance
Farads
when the voltage is doubled, the capacitance will be
halved/half
An insulating material placed between the plates of a capacitor.
Dielectrics
What will happen when capacitor is connected to series?
- There is conservation of charge
- The total capacitance is less than that any of the individual capacitances
What will happen when capacitor is connected to parallel?
- The total charge is the sum of the individual charges.
- The total capacitance is the sum of the individual capacitances.
- The voltage across the capacitors is the same as that across the voltage source.
refers to the movement of electric charges
Current
unit of current
Amps
is expressed in Ampere
Electric current
device used to measure voltage
Voltmeter
CANNOT be affected by the mass of the conductor
Resistance
What law states that current is directly proportional to voltage and inversely proportional to resistance
Ohm’s Law
What will happen if resistors connected in series?
- The same current flows through each resistor in series
- Individual resistors in series do not get the total source voltage, but divide it
- Resistances of resistors in series simply add up
- The current across each resistor remains the same
is a consequence of the law of conservation of charge
First rule of Kirchhoff’s Law
is a consequence of the law of conservation of energy
Second rule (Loop Rule) of Kirchhoff’s Law
Electric potential is commonly known as
Voltage
What is the value of K?
K = 9X10^-9
What is the value of mC?
(Number) x10^-6
What is the value of nC?
(Number) x10^-9
What is the value of Proton?
1.602x10^-19C
What is the value of Electron?
–1.602x10^-19C
