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Le circuit électrique du document 3 comporte
un générateur (G) de tension constante UPN = 24 V:
un rhéostat (Rn) de résistance variable :
une lampe (L) assimilée à un conducteur ohmique et portant
les indications (12 V:6 W);
un voltmètre (V) branché aux bornes de (L).
1) La résistance du rhéostat est réglée de façon que (L) fonctionne
normalement.
1.1) Que représente chacune des indications portées par (L) ?
1.2) Montrer que l'intensité du courant traversant (L) est I1 =0,5 A.
1.3) Déterminer, en appliquant la loi d'additivité des tensions, la
tension UAB aux bornes du rhéostat.
1.4) Montrer que la résistance du rhéostat est R, = 24 Q.
2) La résistance du rhéostat est maintenant réglée à Rz=0.
2.1) Le voltmètre affiche 24 V. Justifier.
2.2) La lampe grille. Expliquer.
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Le circuit électrique du document 3 comporte
un générateur (G) de tension constante UPN = 24 V:
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