Question

Some metal conductor has a resistance of 12ohm. When plugged into a circuit, the amount of heat 144J is released in 12s. What is the voltage at the ends of the conductors?​

Answer 1

The voltage at the end of the conductors is 12V

Step-by-step explanation:

Given:

Resistance, R = 12Ω

Heat released, H = 144J

Time, t = 12s

Voltage, V = ?

According to joule's law:

H = I²RT

where,

I is the current

T is the time

R is the resistance

The above formula can also be written as:

`H = (V^2)/(R) t`

where,

V is the voltage

On substituting the value in the formula we get:

`144 = (V^2)/(12) X 12\\\\V^2 = 144\\\\V = 12`

Therefore, the voltage at the end of the conductors is 12V