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Ex: 1 (Extra). Protection of a lamp. A lamp L carries the indication (8 V). N. P. 1)a ) What does this indication (8 V ) mean ? 2) Consider a battery that provides across its terminals a voltage of 12 V. a) What happens to the lamp if we connect it directly to the battery? Justify.

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Ex: 1 (Extra)

Protection of a lamp

A lamp L carries the indication (8 V).

N

P

1)a) What does this indication (8 V) mean?

2) Consider a battery that provides across its terminals a voltage of 12 V.

a) What happens to the lamp if we connect it directly to the battery? Justify.

b) In order to make (L) function normally, we connect it in series with a resistor (D) of resistance , across the terminals of a battery. The circuit thus carries a current

Find the voltage across the terminals of (D).

b) Deduce the voltage across the lamp.

c) Does the lamp function normally? Why?

d) What is then the role of the resistor in the circuit?

B

C

A

Mr. Bahaa Abou Harfoush

R

(L)

(D)


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