Question

What is the cost per day of operating a lamp that draws a current of 1.7 A from a 110 V line? Assume the cost of energy from the power company is 0.06 USD/kWh.

Answer 1

QuesTion :-

What is the cost per day of operating a lamp that draws a current of 1.7 A from a 110 V line ? (Assume the cost of energy from the power company is 0.06 USD/kWh)

SoluTion :-

$\boxed {\rm {P = V \times I}}$

= 1.45 × 110

= 159.5

$\sf {Energy\ in\ 1\ day =\frac{159.5 \times 86400}{3.6 \times 10^{6}} \ kWh}\\\\\\\sf {= 3.828 \ kWh}$

Cost  = 3.828 × 0.065

Cost = $0.24882

Answer 2

$\rule{200}3$

$\huge\tt{TO~FIND:}$

• The cost of operating a lamp that draws a current of 1.7 A from a 110 V line.

$\rule{200}3$

$\huge\tt{SOLUTION:}$

• Assumption = The cost of energy from the power company is 0.06 USD/kWh

➠P = V × I

➠P = 1.45 × 110

➠P = 159.5

➠Energy in 1 day = 159.5 × 86400 / 3.6 × 10⁶ kWh

➠Energy in 1 day = 3.82

Then,

➠Cost = 3.82 × 0.06

➠Cost = $ 0.24882

$\rule{200}3$