How does power vary with resistance?

The power dissipated in a resistor is given by P = V2/R which means power decreases if resistance increases. Yet this power is also given by P = I2R, which means power increases if resistance increases.

What is the relationship between load and resistance?

A load resistance draws in a load current. So if we say the load increases, in mechanics we mean that the difficulty in moving the car increases that is the torque. In electrical, we mean that the current increses. So this means, that as the load increases, the load resistance decreases.

Does changing the load of a circuit affects the circuit?

For example, a circuit achieves maximum power transfer when the load impedance is equal to the circuit output impedance. A change in the load impedance will affect the charging and discharging of RC time constants. Load impedance affects the performance of circuits, more specifically, output voltages and currents.

Does resistance increase with power?

When power increases, the resistance will also increase keeping current I constant. When Resistance decreases, Power also reduces keeping current I constant.

What happens when resistance is varied?

The variable resistor is a resistor that controls (increase or decrease) the flow of electric current when we vary or change its resistance. In other words, when we vary the resistance of the variable resistor, the electric current flowing through it will increase or decrease.

How does load current vary with load resistance?

The load current decreases as the load resistance increases. This is a logical observation since current and resistance are inversely proportional with respect to voltage (By Ohm’s law).

Why is load resistance used in a circuit?

Load resistors are used for impedance matching, maximum power transfer and to improve output stability as well as to ensure a minimum of current flow. Load resistors are used at the output of a circuit to increase or decrease the power to the load.

Why the output voltage varies as the load increases?

The source of power is an ideal voltage source having zero internal impedance with a series impedance that can have both real (resistive) and imaginary (reactive) components. When you draw more loads you are lowering the load impedance. This increases the voltage drop across the source impedance.

Does increasing load increase current?

When you connect the load at secondary, current flow starts and power increases with increasing load but the power at the primary and secondary remains same. i.e. it is the matter of current or power handling capability at constant voltage that sets the limits.

How does load resistance affect voltage?

Load resistance always added in the overall resistance of the circuit. Which has so many effects on the circuit such as with increase in load resistance, the voltage drop will be increased due to that there will be sudden increase in the heat, which can burn the insulation of the circuit.