Akoranga 25 Mahi Tuatahi ^🔗

For $V=IR$:

1. State what each letter stands for
2. Describe what the variable is measuring in a circuit
3. State the unit that it is measured in.
4. Draw a diagram of a circuit with a $6V$ battery, and three $2\Omega$ resistors in series.
5. Calculate the current flowing through the circuit

Te Whāinga Ako ^🔗

1. Be able to describe and use the power equation $P=IV$

Write the date and te whāinga ako in your book

Power ^🔗

The amount of energy transferred/transformed each second by a circuit component (e.g. bulb or resistor).

\begin{aligned} &P &&= &&&I &&&&\times &&&&&V \newline &\downarrow && &&&\downarrow &&&& &&&&&\downarrow \newline &power &&= &&&current &&&&\times &&&&&voltage \newline &\downarrow && &&&\downarrow &&&& &&&&&\downarrow \newline &watts &&= &&&amperes &&&&\times &&&&&volts \newline &\downarrow && &&&\downarrow &&&& &&&&&\downarrow \newline &W && &&&A &&&& &&&&&V \end{aligned}

Pātai: Re-arranging the Equation ^🔗

In pairs, can you re-arrange this equation to make $V$ and $I$ the subject of the equation?

$I = $ $V = $

Hint: Use your $V=IR$ notes as a guide!

Whakatika ^🔗

\begin{aligned} P = IV \newline V = \frac{P}{I} \newline I = \frac{P}{V} \end{aligned}