18 Questions
When identical cells are connected in series, the total voltage across the cells is:
Equal to the sum of the individual voltages of the cells
In a potential divider circuit, which of the following is NOT a purpose of the variable resistor?
To provide a constant potential difference output
According to Kirchhoff's second law, the sum of all the voltages in a series circuit is equal to:
The battery voltage
In a DC circuit, which of the following is NOT conserved?
Resistance
When identical cells are connected in parallel, the total voltage across the cells is:
Equal to the voltage of one cell
According to Kirchhoff's first law, the total current flowing into a junction is:
Equal to the current flowing out of that junction
If the resistance across R1 in the circuit increases, what will happen to the output potential difference?
Decrease
How does the resistance of a light dependent resistor (LDR) change with increasing light intensity?
Decreases
What effect does switching the positions of the LDR and resistor in the circuit have on the output potential difference?
Increases as light intensity decreases
How is internal resistance (r) in batteries primarily caused?
Through electrons colliding with atoms inside the battery
What is the main reason why some energy is lost inside a battery due to internal resistance?
Electrons colliding with atoms within the battery
In a circuit where a battery has an internal resistance, how does this affect the terminal potential difference compared to an ideal battery?
Decreases terminal p.d
What is the terminal p.d. across the resistor R₁?
2.5 V
What is the value of the lost volts across the internal resistance r?
1 V
What is the total resistance RT of the circuit?
4 Ω
If the internal resistance r is 0.5 Ω and the current I is 2 A, what is the emf of the cell?
10 V
If the terminal p.d. V across R₁ is 7 V and the resistance of R₁ is 3.5 Ω, what is the current flowing through R₁?
1.5 A
If the emf of the cell is 10 V and the total resistance RT is 4 Ω, what is the current I flowing through the circuit?
2.5 A
Learn about how the total voltage changes when identical cells are joined in series or parallel in DC circuits. Understand the concepts of voltage distribution in series and parallel configurations.
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