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Explain why a transformer only works with an alternating current and doesn't with a direct current.

A transformer is designed to step-up or step-down a voltage in a wire to make transferring electricity more efficient. To do this they contain two isolated coiled wires (of varied lengths depending on the tr...
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Answered by Brendan W. • Physics tutor
30894 Views

Define Newtons law of Gravitation (in words or an equation).

Newtons law of gravitation can be described as: The force experienced by a body proportional to the product of the two masses the interaction is between, the gravitational constant 6.67x10 -11 , and the inve...
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Answered by Brendan W. • Physics tutor
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Compare and contrast competitive and non-competitive enzymes inhibitors

Both competitive and non-competitive inhibitors interfere with the functioning of the enzyme's active site, reducing the number of enzyme-substrate complexes that can form. Competitive inhibitors have a shap...
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Answered by Georgia T. • Biology tutor
40078 Views

Given a quadratic equation, how do I find the coordinates of the stationary point?

Example curve: y = x 2 + 4x + 5The first step is to differentiate the equation to give us the gradient at a general point. As a quadratic equation is an example of a polynomial, the solution is as follows:dy...
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Answered by Daniel G. • Maths tutor
5666 Views

What is the difference between B and T cells?

Both cells are white blood cells and are involved in the immune response . There are two main responses you should be aware of The humoral response and The cell-mediated response B cells are white blood cell...
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Answered by Alexander C. • Biology tutor
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