A device to measure electrical potential energy difference, or voltage, is called a(n) a. ammeter.
b. voltmeter.
C. series meter.
d. Ohm meter.
Please select the best answer from the choices provided
ΦΑ
ОВ
C C
D

Will you chech and finish these for me, because i am stumped with them.

Which explanation describes the forces involved for a person to walk down the sidewalk? a. the person's feet push backward on the sidewalk; the sidewalk pushes backward on the person. b. the person's feet push forward on the sidewalk; the sidewalk does not push on the person. c. the person's feet push backward on the sidewalk; the sidewalk pushes forward on the person. d. the person's feet push forward on the sidewalk; the sidewalk pushes forward on the person.

Could someone . i have tried to solve myself but my calculation is off