This is a natural property of substances, due to which it opposes the current flowing through it. The resistor is an electrical component such as other diodes, capacitors, etc. And in electronic circuits, resistors are used to prevent or reduce current flow. All registers have their own resistance which acts as a circuit element in any circuit. The resistance of fixed resistors is fixed because only the temperature can cause a little bit more or less. Variable Resistors we use Depending on the need, it is used inside Volume Control Lamp Dimmer. So that they can be controlled. The unite of resistance is Om. Let's test your knowledge about Electrical Resistance.
1. Which of the following is the formula for electrical resistance?
A. Voltage/ Current
B. Current x voltage
C. Voltage x resistivity
D. None of these
2. Which one instrument can be used to measure resistance?
A. Voltmeter
B. Ammeter
C. Ohmmeter
D. All of the above
3. Calculate the resistance of a metal wire when a voltage of 20 V across it causes a current of 2 A to flow through it?
A. 02 ohms
B. 05 ohms
C. 10 ohms
D. 20 ohms
4. The resistivity of copper is…
A. 50.7 ohms
B. 25.7 ohms
C. 10.7 ohms
D. 05.7 ohms
5. In Ohm's law, if the voltage increases and resistance are constant then current.…
A. Current remains the same
B. Power decreases
C. Current increases
D. None of these
6. Which of the following formula shows a direct proportionality between power and voltage given bellow?
A. P=VI
B. I=RV
C. R=VP
D. All of the above
7. Which type of resistor is found in SIPs and DIPs?
A. Wire wound
B. Thick film
C. Metal oxide
D. All of the above
8. Which one is the two major types for resistors?
A. Fixed & Variable
B. Low & High
C. Both of the above
D. None of these
9. Which of the following statements oblique Ohm's law?
A. Current is inversely proportional to resistance
B. Current is directly proportional to resistance
C. Voltage is indirectly proportional to power
D. All of the above
10. Variable resistor invented by which scientist?
A. Charles Wheatstone
B. William Fothergill Cooke
C. David Brewster
D. Alfred Vail
11. Which are the types of resistors?
A. Metal Film Resistors.
B. Thick Film Resistors.
C. Metal Oxide Resistors.
D. All of the above
12. In which year the first resistor was made?
A. 16 Jun 1959
B. 16 Jun 1969
C. 16 Jun 1979
D. 16 Jun 1989
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