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Chapter 28: Q. 12 (page 790)

$1 k W h$ is how many joules?

Short Answer

Expert verified

$1 k W h = 3.6 \times 10^{6} J$

Step by step solution

01

Given information

We need to find that how many joules.

02

Simplify

The $(k W h)$ is a unit of energy, so we have to convert it into Joule. The power is the rate where the energy is consumed or transferred, so it is energy per time. The unit of power is Joule per second or Watt $(W)$ where $1 W = 1 J / s$ .

$1 k W = 1000 W = 1000 (1 J / s) = 1000 J / s$

$1$ hour represents $60$ minutes and each minute represents $60$ seconds. So, one hour has

$1 h = (60 m i n) 60 \frac{s}{m i n} = 3600 s$

Now, converting $1 k W h$ to Joule by

$1 k W h = 1000 \frac{J}{s} (3600 s) = 3.6 \times 10^{6} J$

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Most popular questions from this chapter

Draw a circuit diagram for the circuit of FIGURE EX28.1.

A $0.25 μ F$ capacitor is charged to $50 V$ It is then connected in series with a $25 Ω$ resistor and a $100 Ω$ resistor and allowed to discharge completely. How much energy is dissipated by the $25 Ω$ resistor?

What is the value of resistor R ?

What is the time constant for the discharge of the capacitors in FIGURE EX28.33?

An electric eel develops a $450 V$ potential difference between its head and tail. The eel can stun a fish or other prey by using this potential difference to drive a $0.80 A$ current pulse for $1.0 ms$ . What are

(a) the energy delivered by this pulse and

(b) the total charge that flows?

See all solutions

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