This equation is incredibly valuable, as it allows you to calculate one of these values when you already know two of them. So, imagine you are presented with voltage and resistance – you now have the ability, thanks to this equation, to calculate the current. In each case, you simply need to know 2 of the values as well as recalling the equation to slot in these two values. Let’s take a look at how you can employ Ohm’s Law during your ASVAB Electronics Information exam:

Q. Calculate the level of amperes when a 140-volt current travels through 7 Ohms.

Let’s not forget that “Ohm” is the mathematical unit for resistance and “Ampere” is the mathematical unit for current. Try not to get confused when you see “140-volt current” – amperes represent current whereas this question specifically states “140-volt”. With this in mind, we only have to slot in these two values (voltage and resistance) into the above equation. When we do this, we find the following: A = 140/7 = 20 amperes! It’s that simple! Similarly, if we were given the amperes and voltage, we would be able to determine the level of resistance thanks to the equation of Ohm’s Law. Another equation we should bear in mind is that used to calculate the amount of watts in a given system. The Watt is a measure of electrical power of a system; we often find the level of wattage on microwaves etc. We can calculate the amount of wattage in a system if we know the values its voltage and its amperes. Let’s take a look at this equation below as it’s another vital concept you will need to comprehend for your ASVAB Electronics Information exam:

Q. What quantity of power is consumed by a light drawing 12 amperes of current at 100 volts?

Watts = Volts x Amperes Watts = 100V x 12A Watts = 1,200 It’s a very simple equation, possessing huge potential in answering many questions on your ASVAB Electronics Information test. Let’s take a look at another example where we already know the level of wattage in the system:

Q. A microwave is certified at 800 watts. At 160 volts, how much current is drawn through the microwave?

Note, as before, that current is the same as amperes – so you’re really asked in this question to calculate the amount of amperes going through the system. Nonetheless, we have the level of watts and the level of volts, so we know which equation we’re entitled to use:

This example is slightly different as we had to isolate amperes from volts and watts as it’s amperes we were looking for. This isolation is possible by dividing watts by volts. If we were looking for volts, we could have similarly divided watts by amperes. This type of manipulation must be part of your skill-set if you’re to understand how to make the most out of these electrical equations. What’s more is that these skills are also necessary for your mathematics knowledge exam and, to some extent, your arithmetic reasoning exam. Either way, we can see how through Ohm’s Law equation and through the Wattage equation, we can answer many important questions that regularly appear on the ASVAB Electronics Information test. With this in mind, we’re now in a position to move onto our next subject – discussing the close relationship between the concepts of electricity and magnetism.