A water heater rated 40w is connected to an a.c source of 220v if the minimum value of current flows through it for 30minutes through the system determine:
The work done by the system
The current flowing through the system
The oppopsition the water heater offers
The work done by the system can be calculated using the formula:
Work = Power x Time
Work = 40W x 30 minutes = 1200 Watt-minutes = 1200/60 = 20 Watt-hours
The current flowing through the system can be calculated using the formula:
Current = Power / Voltage
Current = 40W / 220V = 0.1818 Amps
The opposition the water heater offers (resistance) can be calculated using Ohm's Law:
Resistance = Voltage / Current
Resistance = 220V / 0.1818A = 1210.5 ohms
Therefore, the work done by the system is 20 Watt-hours, the current flowing through the system is 0.1818 Amps, and the opposition the water heater offers is 1210.5 ohms.