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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

The circuit shown in FIGURE P28.48 is inside a $15 cm$ diameter balloon filled with helium that is kept at a constant pressure of $12 atm$ . How long will it take the balloon’s diameter to increase to 16 cm?

A circuit you’re using discharges a $20 μ F$ capacitor through an unknown resistor. After charging the capacitor, you close a switch at $t = 0 s$ and then monitor the resistor current with an ammeter. Your data are as follows:

Use an appropriate graph of the data to determine

(a) the resis-tance and

(b) the initial capacitor voltage.

What is the current in the $2 Ω$ resistor in FIGURE P28.53?

A standard $100 W (120 V)$ lightbulb contains a $7.0 c m$ -long tungsten filament. The high-temperature resistivity of tungsten is $9.0 \times 10^{- 7} Ω m$ . What is the diameter of the filament?

The switch in FIGURE CP28.80 has been closed for a very long time.

a. What is the charge on the capacitor?

b. The switch is opened at t = 0 s. At what time has the charge on the capacitor decreased to 10% of its initial value?

See all solutions

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