In the circuit above R is a resistor whose resistance increases with an increase in temperature....

In the circuit above R is a resistor whose resistance increases with an increase in temperature....

WAEC 1991

In the circuit above R is a resistor whose resistance increases with an increase in temperature. L1 and L2 are identical lamps. If the temperature of R increases

A. L₁ becomes brighter and L₂ becomes dimmer
B. L₁ becomes brighter and L₂ does not change
C. L₂ becomes dimmer and L₁ does not change
D. L₁ becomes dimmer and L₂ does not change
E. L₁ and L₂ becomes brighter

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Correct Answer: Option E

Explanation

L2 is in series with the resistor while L1 is in parallel to the resistor, therefore both L1 and L2 will become brighter.

in series connection high resistance produces a brighter glow while in parallel connection lower resistance produces a brighter glow.

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