Which is the highest resistivity?
Nichrome has the highest resistivity and shows the heating effect of electric current because of its high resistance, it opposes the flow of current and hence, it produces a lot of heat.
What is an electric conductor give examples of good electric conductors?
Materials that have low resistance to electric current are called electric conductors. Many metals—including copper, aluminum, and steel—are good conductors of electricity. The outer electrons of metal atoms are loosely bound and free to move, allowing electric current to flow.
Does plastic have a high resistance?
Plastic materials are often selected for applications that require toughness and impact resistance. Certain plastics such as ABS, polycarbonate, PPSU, and UHMW have outstanding toughness. … Plastic material with excellent mechanical strength, stiffness, and abrasion resistance.
Which of the following is the good conductor?
Now, from the given options graphite is the good conductor of electricity.
What are the 5 sources of emf?
The five sources of EMF are: Electromagnetism, Photoelectric, Thermoelectric, Piezoelectric and Chemical.
What are sources of electromotive force?
electromotive force, abbreviation E or emf, energy per unit electric charge that is imparted by an energy source, such as an electric generator or a battery. Energy is converted from one form to another in the generator or battery as the device does work on the electric charge being transferred within itself.
What produces an electromotive force?
In nature, emf is generated when magnetic field fluctuations occur through a surface. … The emf is countered by the electrical voltage due to charge separation. If a load is attached, this voltage can drive a current. The general principle governing the emf in such electrical machines is Faraday’s law of induction.
What is an example of Ohm’s law?
What is CBSE 10th resistivity?
Resistivity is defined as the electrical resistance of a conductor of unit cross-sectional area and unit length. The resistance of any conductor is directly proportional to the length of the conductor and inversely proportional to the area of cross-section of the conductor.
Is house electricity AC or DC?
When you plug things into the outlet in your house, you don’t get DC. Household outlets are AC – Alternating Current. This current has a frequency of 60 Hz and would look something like this (if you plotted current as a function of time).
What does resistance mean in history?
the act or power of resisting, opposing, or withstanding. the opposition offered by one thing, force, etc., to another.
What is an act of resistance meaning?
uncountable noun. Resistance to something such as a change or a new idea is a refusal to accept it.
What does resistance mean in chemistry?
Chemical resistance is the strength of a material to protect against chemical attack or solvent reaction. It is the opposite of chemical reactivity. … A chemical resistance chart may be used to see the relative resistance of materials.
What is the best synonym for resistant?
durable
- resistant.
- sound.
- stable.
- stout.
- strong.
- substantial.
- tenacious.
- tough.
How do you use piece de resistance in a sentence?
the outstanding item (the prize piece or main exhibit) in a collection 2. the most important dish of a meal. 1 Of all the events, the piece de resistance will be a gala night at the King’s Hall. 2 Father Tim said mildly having saved this piece de resistance for the right moment.
What is the definition of resistance quizlet?
Resistance. The measure of how difficult it is for charges to flow through a material.
What is an example of a resistor for kids?
A resistor limits the electrical current that flows through a circuit. For example, in a light bulb there is a resistor made of tungsten which converts the electrons into light. …What are resistors used for kids?
The resistor is the part of an electrical circuit that resists, or limits, the power of an electrical current in a circuit. The resistor also helps to reduce, or lessen, the amount of electricity moving through the circuit.What do you understand about resistance?
Resistance is a measure of the opposition to current flow in an electrical circuit. Resistance is measured in ohms, symbolized by the Greek letter omega (Ω). … All materials resist current flow to some degree.
What causes higher resistance?
The moving electrons can collide with the ions in the metal. This makes it more difficult for the current to flow, and causes resistance. The resistance of a long wire is greater than the resistance of a short wire because electrons collide with more ions as they pass through.
