1. The SI unit of electric current is:
A. Volt
B. Ampere
C. Ohm
D. Coulomb
Answer: B. Ampere
2. The SI unit of voltage is:
A. Volt
B. Ampere
C. Ohm
D. Joule
Answer: A. Volt
3. The unit of electrical resistance is:
A. Ampere
B. Joule
C. Ohm
D. Watt
Answer: C. Ohm
4. The SI unit of electrical power is:
A. Joule
B. Watt
C. Coulomb
D. Ohm
Answer: B. Watt
5. Which of the following is the correct formula for electrical power?
A. P=V×IP = V \times I
B. P=V+IP = V + I
C. P=I/VP = I / V
D. P=R/VP = R / V
Answer: A. P=V×IP = V \times I
6. One kilowatt is equal to:
A. 100 W100 \, \text{W}
B. 1,000 W1,000 \, \text{W}
C. 10,000 W10,000 \, \text{W}
D. 100,000 W100,000 \, \text{W}
Answer: B. 1,000 W1,000 \, \text{W}
7. The formula to calculate resistance is:
A. R=I/VR = I / V
B. R=V/IR = V / I
C. R=P×VR = P \times V
D. R=V×IR = V \times I
Answer: B. R=V/IR = V / I
8. What is the unit of charge?
A. Ampere
B. Coulomb
C. Volt
D. Farad
Answer: B. Coulomb
9. If 1 A1 \, \text{A} of current flows through a conductor for 1 s1 \, \text{s}, the total charge is:
A. 1 C1 \, \text{C}
B. 1 V1 \, \text{V}
C. 1 W1 \, \text{W}
D. 1 J1 \, \text{J}
Answer: A. 1 C1 \, \text{C}
10. Power is related to energy as:
A. P=E×tP = E \times t
B. P=E/tP = E / t
C. P=t/EP = t / E
D. P=EP = E
Answer: B. P=E/tP = E / t