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A torch uses 15watts of energy. It uses two 1.5volt batteries connected in series. What is the resistance in the circuit of the torch?

In order to answer this question, we need a formula which relates resistance to voltage and power. We don't already know this formula, but can create it from two formulae we already know: P=IV & V=IR. As...
HW
Answered by Hugo W. • Physics tutor
2503 Views

Describe ritornello form and give an example of where it is used

Ritornello form was used most predominantly in the Baroque era. The term ‘ritornello’ translates as ‘little return’ and is a passage of music that reoccurs throughout a piece; these passages are separated by...
EM
Answered by Emelye M. • Music tutor
21461 Views

Could you explain the how an AC generator works?

Simply, a generator uses the rotation of a coil of wire in a magnetic field to produce electricity. (The principle of electromagnetic induction/ faraday's law : Any change in the magnetic environment of a co...
AR
13490 Views

Why does differentiation give us the results that it does?

A quick analysis here is based on the fact that y=(x 2 ). A big change is worked out between two points. The gradient between x=1 and x=2 is equal to 3. BUT we know the gradient is constantly changing so thi...
AA
Answered by Alexander A. • Maths tutor
4224 Views

(Psychology Interviews) What is an ideal sample size for an experiment and why?

Rather than declaring a given number as an ideal sample size, it's better to look at what the study is looking for and what type of experimental method is used. For lab experiments looking at the effects of ...
RT
1927 Views