21. Which of the following is the correct symbol for electric current?
a) R
b) V
c) I
d) P
Answer: c) I
22. Which of the following is the correct symbol for electric resistance?
a) R
b) V
c) I
d) P
Answer: a) R
23. If the resistance of a circuit is doubled while the voltage remains the same, what happens to the current?
a) It doubles
b) It halves
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c) It remains the same
d) It is impossible to determine
Answer: b) It halves
24. What is the voltage across a circuit if the resistance is 6Ω and the current is 2A?
a) 8V
b) 3V
c) 12V
d) 1V
Answer: c) 12V
25. Which of the following is the correct symbol for electric potential difference?
a) R
b) V
c) I
d) P
Answer: b) V
