Complete the sentence by putting a cross (✗) in the box next to your answer - Edexcel - GCSE Physics - Question 5 - 2013 - Paper 1

To calculate power, we can use the formula:

$P = V imes I$

where:

• $P$ is the power in watts (W),
• $V$ is the voltage in volts (V), and
• $I$ is the current in amperes (A).

Substituting the values:

$P = 230 ext{ V} imes 12 ext{ A} = 2760 ext{ W}$

Thus, the power of the kettle is 2760 W.

First, calculate the energy consumed by the television in kWh:

$ext{Energy (kWh)} = ext{Power (kW)} imes ext{Time (h)}$
= \frac{400 ext{ W}}{1000} imes 10 ext{ h} = 4 ext{ kWh}.

Now, calculate the cost based on the rate of 15p per kWh:

= 4 ext{ kWh} \times 15 ext{ p/kWh} = 60 ext{ p}.$$ Therefore, the cost of using the television for 10 hours is 60 p.