Question
A metal wire is connected between the terminals of a cell so that there is a current in the wire.
Which statement is correct?
(A) Negatively charged electrons in the wire move from the negative terminal to the positive terminal.
(B) Negatively charged nuclei in the wire move from the negative terminal to the positive terminal.
(C) Positively charged electrons in the wire move from the positive terminal to the negative terminal.
(D) Positively charged nuclei in the wire move from the positive terminal to the negative terminal.
Answer/Explanation
Ans: A
Question
Which charge can be carried by a charge carrier?
(A) $1.1 × 10^{–19}C$
(B) $4.0 × 10^{–19}C$
(C) $4.8 × 10^{–19}C$
(D) $9.1 × 10^{–19}C$
▶️Answer/Explanation
Ans: C
Question
The electric current in a metal wire is 4.0 mA. How many electrons pass a fixed point in the wire in a time of 10 hours?
(A) $2.5 × 10^{17}$
(B) $2.5 × 10^{20}$
(C) $9.0 × 10^{20}$
(D) $9.0 × 10^{23}$
▶️Answer/Explanation
Ans: B
Question
The diagram shows a cell with internal resistance connected in parallel with a fixed resistor and a variable resistor.
The resistance of the variable resistor is decreased. What happens to the potential difference V across the variable resistor and the current I in the variable resistor? 
▶️Answer/Explanation
Ans B