If the resistance of a load becomes larger does the current increase or decrease? why explain?

Question

please explain the logic behind your answer.

Answer 1

Think of the entire system as a series of pipes and valves, which is kind of what it is, except instead of water flowing, we are talking about electrons.

The voltage of a system is like the water pressure.  When there is resistance to the flow (like a half-closed valve), the pressure builds behind it - this is the voltage that appears across a load.  The current is the flow through that valve, or load.

As the valve is shut, the flow is lessened.  As there is less flow, the pressure above the valve becomes greater (voltage across the load increases).  When the valve is fully shut off, no current flows and all the pressure of the system is behind that valve (so for an infinitely high resistance, you will measure the entire voltage drop acrtoss that resistor, and the current flow is non-existent).

If the valve is opened wider, resistance decreases, current flow increases, and pressure behind the valve drops - in other words, as load decreases, current through the circuit is greater, but the voltage across the load drops.  If the valve is wide open, current flow is maxed out, and there is no pressure (voltage) at the load-valve - a short circuit.  In an electrical circuit, this will result in huge current flows, and the tiny resistance of the wires will be all that the voltage can develop over - if the current is not limited, the wires will get hot enough to melt the metal wires.

Answer 2

I assume you are talking about an electrical circuit.

If you are; then you must observe Ohms law.

By ohms law; the voltaje drop across a resistor is directly proportional to the resistor value and the current flowing through it.

V = R*I

Then if you solve this equation for current; you get:

I = V/R.

If you keep the voltage constant; then you can easily see that if you increase the resistor value; the current decreases; and vice versa.

In plain english (and in terms of electricity);  "resistance" means "opposition" to current flow; if you increase the resistance; then you decrease the current.