Answer:
(a). The resistance of this resistor is 87.72 Ω.
(b). The current is 0.147 A.
(c). The potential difference across the terminals of the battery is 40 volt.
Explanation:
Given that,
Voltage = 1.50 V
Current = 17.1 mA
(a). We need to calculate the resistance of this resistor
Using ohm's law
Put the value into the formula
(b). If you now place the resistor across the terminals of a 12.9 V car battery having no internal resistance,
We need to calculate the current
Using ohm's law
Put the value into the formula
(c). The resistor across the terminals of an unknown battery of negligible internal resistance and measure a current of 0.456 A flowing through it.
We need to calculate the potential difference across the terminals of the battery
Using formula of potential difference
Put the value into the formula
Hence, (a). The resistance of this resistor is 87.72 Ω.
(b). The current is 0.147 A.
(c). The potential difference across the terminals of the battery is 40 volt.