What is the relationship between power (P), energy (E) and time (t)?
\[P= Et\]
\[P= \frac{E}{t}\]
\[P= \frac{t}{E}\]
What is the relationship between power (P), voltage (V) and current (I)?
\[P=VI\]
\[P= \frac{V}{I}\]
\[P={V^2}{I}\]
What is the relationship between power (P), voltage (V) and resistance (R)?
\[P=VR\]
\[P= \frac{V^2}{R}\]
\[P={V^2}{R}\]
What is the relationship between power (P), current (I) and resistance (R)?
\[P=IR\]
\[P= \frac{I}{R}\]
\[P={I^2}{R}\]
A resistor transfers 5W of power when there is a voltage of 18V across it. What is its resistance?
\[3.6 \Omega\]
\[64.8 \Omega\]
\[90 \Omega\]
What is the correct value of fuse that should be fitted in a 1.2kW hairdryer?
3A
13A
230A
When switched on, a mains powered grilling machine has a current of 3.1A in it. What is the power of the machine?
74W
155W
713W
What is the current in a 36W lamp with a filament resistance of \(4 \Omega\)?
9A
144A