According to Ohm’s law, which combination of units is the same as the unit for voltage? ohm ÷ ampere
ampere × ohm
ohm + ampere
ampere ÷ ohm

According to Ohm's law :

Where,

V is the potential difference or voltage.

I is the current flowing in a circuit.

R is the resistance.

The SI unit of potential difference is Volt. It is denoted as V.

The SI unit of current is Ampere. It is denoted as A.

The unit for resistance is :

It is equivalent to Ohm or .

Hence, the correct option is (a) " volt ÷ ampere ".

t = 1/400 h   ⇔ 0.0025 h ⇔ 9s ⇔ 0.15 m

any of the answers are correct.