Atransformer connected to a 120--v ac line is to supply 12.0v (rms) to a portable electronic device. the load resistance in the secondary is 4.70 ohms

1) what should the ratio of primary to secondary turns of the transformer be?

n1/n2 =

2) what rms current must the secondary supply?

i = a

3) what average power is delivered to the load?

p = w

4) what resistance connected directly across the source line (which has a voltage of 120? v ) would draw the same power as the transformer?

r = ohms

Match each vocabulary term to its definition. 1. electrons neutral subatomic particles found in the nucleus of the atom 2. neutron lowest energy position of an electron in an atom 3. photon the path of an electron around the nucleus of an atom 4. ground state negatively charged, subatomic particles 5. protons packet of energy of specific size 6. element substance with only one type of atom 7. orbital positively charged, subatomic particles found in the nucleus of the atom

Acommercial refrigerator with refrigerant-134a as the working fluid is used to keep the refrigerated space at -35°c by rejecting waste heat to cooling water that enters the condenser at 18°c at a rate of 0.25 kg/s and leaves at 26°c. the refrigerant enters the condenser at 1.2 mpa and 50°c. if the compressor consumes 3.3 kw of power, determine (a) the mass flow rate of the refrigerant, (b) the refrigeration load, (c) the cop, and (d) the minimum power input to the compressor for the same refrigeration load.

Which model displays the change in a gas when the temperature of the gaseous system decreases?