When unequal resistors are connected in parallel in a circuit:
1 answer:
Answer:
B) the potential drop is always the same across each resistor
Explanation:
Resistors are said to be in parallel if they are connected in different branches, and the end of each branch corresponds to the end of the other branches: so that, they are connected to points at same voltage. So, resistors in parallel have the same potential drop across them.
Therefore, we can analyze each statement:
A) the largest resistance has the largest current through it. --> FALSE. The current through each resistor is given by Ohm's law:
where V is the potential drop and R the resistance. As we see, since the voltage is constant, the larger the resistance, the less the current.
B) the potential drop is always the same across each resistor. --> TRUE, for what we said above.
C) the same current always runs through each resistor. --> FALSE, for what we said in part A.
D) the power generated in each resistor is the same. --> FALSE. The power dissipated in each resistor is
where V is the voltage and R the resistance; the voltage is the same for all resistors, however the resistance is not, so the power dissipated is not the same.
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Answer:
The internal resistance of the cell is 0.051 ohm.
Explanation:
Given;
emf of the battery, E = 12 V
terminal voltage of the cell, V = 8.2 V
current in the circuit, I = 75 A
let the potential drop of the cell due to internal resistance (r) = Ir
The internal resistance of the cell is calculated from the equation below;
E = V + Ir
where;
r is the internal resistance of the cell
Therefore, the internal resistance of the cell is 0.051 ohm.