Question

How many volts are supplied to operate an indicator light on a DVD player that has a resistance of 140Ω, given that 25.0 mA passes through it?

a) 3.50 V
b) 35.0 V
c) 8.75 V
d) 0.350 V

Answer 1

Using Ohm's law, the voltage required to operate an indicator light on a DVD player with 140Ω resistance and a current of 25.0 mA is calculated as 3.5 volts, corresponding to option (a) 3.50 V.

Step-by-step explanation:

The question relates to Ohm's law, which is used to calculate the voltage when current and resistance are known. According to Ohm's law, V (voltage) = I (current) × R (resistance). The current given is 25.0 mA (milliamps), which is equal to 0.025 A (amperes) when converted to the standard unit. Thus, we can calculate the voltage as follows:

V = 0.025 A × 140 Ω

V = 3.5 volts

Therefore, the answer is 3.5 volts to operate an indicator light on a DVD player with the given resistance and current, which corresponds to option (a) 3.50 V.