CIE iGCSE Co-Ordinated Science P4.2.2 Electric current Exam Style Questions Paper 1
▶️ Answer/Explanation
Electric current is defined as the rate of flow of electric charge, and in metallic conductors, this charge is carried by delocalised electrons moving through the material. Power is the rate of energy transfer, resistance opposes current, and voltage is the driving force that causes current to flow.
✅ Answer: (A)
✅ Answer: (A)
▶️ Answer/Explanation
Metals contain a “sea” of delocalised electrons that are free to move throughout the metal structure.
When a potential difference is applied, these free electrons drift through the wire, constituting an electric current.
Protons and neutrons are fixed within the atomic nuclei of the metal and cannot flow.
✅ Answer: (A)
When a potential difference is applied, these free electrons drift through the wire, constituting an electric current.
Protons and neutrons are fixed within the atomic nuclei of the metal and cannot flow.
✅ Answer: (A)
▶️ Answer/Explanation
Current is related to e.m.f. and resistance by Ohm’s law: \( I = \frac{V}{R} \).
To increase the current, V must increase and/or R must decrease.
Row C shows an increase in V combined with a decrease in R, which both act to increase the current.
✅ Answer: (C)
To increase the current, V must increase and/or R must decrease.
Row C shows an increase in V combined with a decrease in R, which both act to increase the current.
✅ Answer: (C)
Question
A 6.0V battery is connected to a lamp. The current in the circuit is 0.60A.
What is the resistance of the lamp?
A 0.10 B 3.6 C 10 D 36
▶️Answer/Explanation
Ans :C
Question
A 2.0Ω resistor and a 3.0Ω resistor are connected in series with a 10V battery.
What is the current in the circuit?
A 0.50A B 2.0A C 5.0A D 50A
▶️Answer/Explanation
Ans : B