I need only the making guide if is a or b

Here is the making guide for your questions:

QUESTION 9

9.1 Explain, in words, the meaning of an emf of 12 V.

An electromotive force (emf) of 12 V means that the battery supplies 12 Joules of electrical energy to every 1 Coulomb of charge that passes through it. This energy is converted from chemical energy within the battery.

9.2 Calculate the current that passes through the electrical device.

Step 1: Use the power formula for the electrical device.
The power dissipated by the electrical device is given as $P_{device} = 5 \text{ W}$, and its resistance is $R_{device} = 5 \Omega$. The formula for power is $P = I