Question

What will occur if a resistor with high resistance is inserted into a circuit?

Answer 1

Answer:

D. There will be a low current drop across it.

Explanation:

The current may be substantially reduced by inserting a high resistance between two points (for the sake of this example, we'll use A and B). High resistances in an electrical current tend to reduce greatly the flow of charge, and they also have large potential drops across them.

Answer 2

If the resistor is in series with the rest of the circuit then a is the correct answer. The voltage across the resistor in series with another resistor is
$V \frac{R}{R+r}$
where R is the big resistor and r is the small one and V is the total voltage drop across both.  This is called a voltage divider