Explanation:
Current drawn by the kettle, $\text{I}=\frac{\text{P}}{\text{V}}=\frac{3000}{230}=13\text{A}$
So the cable should be able to carry more current than this and hence the answer is 15A.
Explanation:
Electrical energy consumed in three hours = P × t = 2kW × 3 hour = 6kWh
Unit cost = Rs. 4 = per kWh
Therefore, the cost of energy used for three hours = 4 × 6 = Rs. 24
Explanation:
An electric fuse works on the heating effect of current.
Explanation:
Resistance = $25Ω$
Voltage = 230V
$\text{Current}=\frac{\text{Voltage}}{\text{Resistance}}$
$\text{I}=\frac{\text{V}}{\text{R}}$
$\text{I}=\frac{230}{25}$
$\text{I}=9.2\text{A}$
Thus, if an electrical appliance has a resistance of $25Ω$ and when that electrical appliance is connected to a 230V supply line, the current passing through it will be 9.2A.
Explanation:
Voltage, V = 12V
Current, I = 0.5A
Resistance, $\text{R}=\frac{\text{Voltage}}{\text{Current}}$
$\text{R}=\frac{12}{0.5}$
$\text{R} = 24Ω$
Thus, if a car's headlight bulb working on a 12V car battery draws a current of 0.5A, the resistance of the light bulb will be $ 24Ω$
Which of the following statements about the currents at X, Y and Z is correct?
Explanation:
This is so because Y alone will offer less resistance.