When we want to make sure to include both in our discussion of the behavior of circuits with alternating current, we talk about electrical impedance, which combines the specific case of resistance discussed above and capacitive and inductive reactance. When we say “resistance” we could mean a specific case in the example with thermal energy above, or we could talk about resistance and resistivity in general. If there is a large amount of inductance in the circuit, then we consider inductive reactance, and if there is capacitance, then we talk about capacitive reactance. On the other hand, when the electrical energy is reversibly converted into energy of a magnetic or an electric field, and if the alternating current runs through the circuit, we consider electrical reactance. When the conversion from electrical energy to thermal energy is irreversible, we talk about resistance. It is calculated as a ratio of the potential difference (voltage) between two points of the circuit to the current that runs through the circuit.Įlectrical resistance is related to the transport and conversion of electrical energy to other types of energy. In electrical engineering, resistance is a property of an electrical circuit or its part, which prevents electric current from flowing freely through it. The resistance of electrical cables must be as small as possible Definition of Electrical ResistanceĮlectrical resistance is a physical quality of matter to resist the loss-free flow of an electric current through it. We could say that along with the other passive electronic components such as inductors and capacitors, resistors are part of the foundation of our civilization as we know - they are the metaphorical whales that our world rests on. Given the amount of production of such devices globally, we can estimate that there are tens of trillions of them. Statistically, more than 35% of electronic components on circuit boards are resistors. It is enough to mention that in the most common electronics used today - mobile phones, smartphones, tablets, and computers - the number of resistors can reach several hundred thousand. It is used so much in today’s world, that we cannot even count all of the resistors - devices that operate based on resistance. Electrical resistance usually does not cause bewilderment or misunderstanding when we study it at school. For example, we face resistance of the other child, whose toy we try to borrow. When we are small, we explore our environment and learn about various types of resistance, not only in the electrical sense. We can say that the term “resistance” is more “lucky” than many other terms in physics, because we are used to this word and its meaning from early childhood. Loadhook can insure the electric chain hoist you’re seeking for your operations ensures maximum safety, efficiency, durability and economy.Resistors on this power supply circuit board are marked in red and make up half of its components. If you are mounting the hoist to a motorized trolley, you will need to add the two horsepower values together (hoist and trolley) and then use the chart to determine the total amp draw.Īdditional items will need to be taken into consideration as your system gets more complex.

The spec sheet for the hoist will tell you the horsepower value for that hoist. An electric chain hoist uses a motor for the lifting operation. You will need to know these two values to accurately determine the amp draw based on horsepower. The below chart breaks down the values based on single phase or three phase power which would be the power supply in your area as well as standard voltages.

Knowing this value is important during the design or development stage of your purchasing process because it identifies if your circuit has enough ampacity to handle the additional load of the hoist. Here we are determining the amp draw of an electric chain hoist based on the horsepower of the motors. Horsepower is a unit of power that is the rate at which work is done.

Amp draw measures how much power your machine consumes during operation.

Amp to volt conversion