The Voltage Drop Across a Metal Bar Is $5.0 \mathrm {~V}$

Multiple Choice

The voltage drop across a metal bar is $5.0 \mathrm {~V}$ while a current of $10.0 \mathrm {~mA}$ flows through it. How much power does this bar dissipate?

A) 50 mW
B) 500 ?W
C) 2.5 kW
D) 0.50 kW