A 12 V supply is connected to a 4 ohm resistor and an 8 ohm resistor in series. What current flows in the circuit?
Answer and explanation
Correct answer: B. 1 A
- Step 1: In a series circuit the resistances add: 4 + 8 = 12 ohms. Step 2. Current = V / R = 12 / 12 = 1 A. Answer: 1 A. Why not the others: 3 A and 1.5 A ignore one resistor; 4.5 A uses the parallel formula (about 2.67 ohms) which is wrong for a series circuit.
Practise more Physics, Chemistry and Biology Basics.
Free questions with an explanation for every one, and full timed Iraqi Third Intermediate Ministerial Exams mock tests.
More Physics, Chemistry and Biology Basics questions
- Which part of a plant cell is mainly responsible for photosynthesis?
- Which gas do plants take in from the air as a raw material for photosynthesis?
- What is the chemical formula of water?
- What is the SI unit of electrical resistance?
- A current of 2 A flows through a resistor of 6 ohms. What is the potential difference across the resistor?
- What is the chemical symbol for sodium?