DC Circuits and Measurements
ICSE · Class 12 · Physics
Flashcards for DC Circuits and Measurements — ICSE Class 12 Physics. Quick Q&A cards covering key concepts, definitions, and formulas.
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See them allState the definition of an electric cell.
Answer
An electric cell is a source of electrical energy which maintains a continuous flow of charge in a circuit. It consists of two electrodes immersed in an electrolyte. Chemical reaction in the electroly…
Why is electromotive force not a real force?
Answer
Electromotive force is the work done by a cell in forcing unit positive charge to flow in the whole circuit, including the cell. Its unit is volt, not newton. It is called force only historically.
State the formula for emf and explain the symbols.
Answer
Formula: E = dW/dq Meaning: E = emf, dW = work done by the cell, dq = charge flown. Unit: 1 V = 1 J C^-1. Quick meaning: 1 volt means 1 joule of work is done in moving 1 coulomb of charge.
A cell does 1350 J of work in driving 900 C of charge. Find its emf.
Answer
Given: W = 1350 J, q = 900 C Formula: E = W/q Step 1: E = 1350 J / 900 C Step 2: E = 1.5 J C^-1 Step 3: E = 1.5 V Answer: 1.5 V…
State two facts about emf of a cell.
Answer
1. EMF does not depend on the dimensions of the electrodes, their separation, or the quantity of electrolyte. 2. If a dry cell of emf about 1.5 V is cut into two parts, each part has the same emf as t…
What is terminal potential difference?
Answer
Terminal potential difference is the work done for the flow of unit charge in the external circuit only. Formula: V = dW'/dq Meaning: V = potential difference, dW' = energy consumed in that part, dq =…
A cell of emf 10 V and internal resistance 3 ohm sends current 0.5 A through an external resistor. Find the resistor and terminal voltage.
Answer
Given: E = 10 V, r = 3 ohm, I = 0.5 A Formula: E = I(R + r) Step 1: R + r = E/I = 10/0.5 = 20 ohm Step 2: R = 20 - 3 = 17 ohm Formula for terminal voltage: V = IR Step 3: V = 0.5 A x 17 ohm = 8.5 V An…
State the relation between emf, terminal voltage, current, and internal resistance.
Answer
Relation: E = V + Ir Also: V = E - Ir Meaning: E = emf, V = terminal potential difference, I = current, r = internal resistance. When current is drawn from a cell, V < E.
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