Home › Karnataka PUC II › Physics › Current Electricity › A 12 V battery with internal resistance 2 Ω is c…
A 12 V battery with internal resistance 2 Ω is connected across a 4 Ω resistor. The TERMINAL voltage of the battery is
A4 V
B12 V
C8 V
D6 V
Answer & Solution
Correct answer: C. 8 V
I = 12/(4+2) = 2 A. Terminal V = ε − Ir = 12 − 2·2 = 8 V. Equivalently V = IR_ext = 2·4 = 8 V.
Related questions
The reactance of a capacitor $C$ at frequency $f$ in an a.c. circuit is:A bird perched on a single high voltage wire is unharmed because:The two conservation laws embodied in Kirchhoff's rules are conservation of:The resistance offered by the cell itself is called:Which device detects the current in a Wheatstone bridge?In a Wheatstone bridge, the source is connected across the:The Wheatstone bridge is made up of how many resistors?At a junction, the current entering equals the current: