Formula for electrical work

Particles that are free to move, if positively charge normally tend towards regions of lower voltage (net negative charge), while if negatively charged they tend to shift towards regions of higher voltage (net positive charge). A BBC Bitesize secondary school revision resource for Higher Physics on energy and voltage: electric fiel potential difference, EMF, internal resistance. Electrical charge is measured in coulomb, C. The equation below shows the relationship between charge, current and time: charge (coulomb, C) = current . The electric field is by definition the force per unit charge, so that multiplying the field times the plate separation gives the work per unit charge, which is by definition the change in voltage.

So lifting your Hiwatt DR1from the floor to your work bench requires work , because you are moving the amp upwards against the force of gravity that opposes it.

The relationship between voltage, .

A secondary school revision resource for AQA Additional GCSE Science about electricity and circuits. E is the energy transferred in joules, J. I is the current in amperes, A. V is the potential differences in volts, V. Practitioners rarely speak of potential difference, when electrical voltage (drop) is meant. The calculator works in both directions of the ↔ sign. Examples are electrical appliances, such as light bulbs, electric motors, and electric heaters. In alternating current (AC) circuits the direction of . In physics, power is the rate of doing work , the amount of energy transferred per unit time.

This set of problems targets your ability to determine circuit quantities such as current, resistance, electric potential difference, power, and electrical energy. You can work out power using this equation : power (watt, W) = voltage (volt, V) × current (ampere, A). What is the power if the voltage is 12V . Let me write the formula so you can see for yourself.

The work done will be changed to the electric potential energy and stored in the charge. The metric units for force are newtons, those for distance are meters and those for work are newton-meters, or joules. In each of these devices, the electrical potential energy of the charge is transformed into other useful (and non-useful) forms. If we know how much work is done on the charge as it passes through the electrical fiel we can find its velocity. The moving charge is doing work upon . Potential energy can be defined as the capacity for doing work which arises from position or configuration.

See how this power translates into the energy we see at work in light bulbs and other electrical products.